Absence of bicoid mrna from a drosophila egg leads to the absence of anterior larval body parts and mirror-image duplication of posterior parts. normally leads to formation of head structures, this is evidence that the product of the bicoid gene
Anterior-posterior axis formation in the embryonic stage of Drosophila development is carried out by a protein that is produced by the bicoid gene.
The bicoid protein is found at the anterior end of the drosophila egg, where it represses the expression of mRNAs that are translated at the posterior end and aids in the expression of only anterior genes. As a result, the anterior end of the egg plays a crucial role in the formation of anterior structures, including the head of the fruit fly.
Since the loss of anterior larval body parts happens in the absence of bicoid mRNA, it follows that bicoid must be defining the head structures from the supplied question.
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complete question is :
Absence of bicoid mRNA from a Drosophila egg leads to the absence of anterior larval body parts and mirror-image duplication of posterior parts. This is evidence that the product of the bicoid gene
(A) normally leads to formation of head structures.
(B) normally leads to formation of tail structures.
(C) is transcribed in the early embryo.
(D) is a protein present in all head structures.
the hypothalamus secretes two types of neurohormones called hormones and hormones. State True or False your answer:
a. True
b. False
Answer:
b. False
Explanation:
Hypothalamus play the important role in the release of many hormones. For example when the level of growth hormone is low, the hypothalamus releases growth hormone releasing factor which stimulate the pituitary gland to release growth hormone.
in the scientific method, after a question is made, what is the next step? responses collect data collect data make a conclusion make a conclusion experiment experiment make a hypothesis
The scientific method is a process that is used to answer questions and solve problems. It is a widely accepted process used by scientists all over the world to gain knowledge and understanding.
After a question is made, the next step in the scientific method is to make a hypothesis. A hypothesis is an educated guess about what the answer to the question could be. It is an educated guess because the guess is based on the researcher’s knowledge, observations, and research. This hypothesis is then tested in an experiment.
An experiment is a test of the hypothesis. It is used to determine if the hypothesis is correct or not. An experiment should be designed in a way that allows the researcher to answer the question in a clear and concise manner. Once the experiment is complete, the researcher collects and analyzes the data. This data helps the researcher draw a conclusion. A conclusion is the final answer to the question. It is based on the data collected during the experiment and the results of the experiment.
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the synthesis of sugar molecules through photosynthesis requires energy to be absorbed from sunlight. considering this fact, what kind of reaction is photosynthesis?
Energy from sunlight must be absorbed for the photosynthesis of sugar molecules to occur. Therefore, photosynthesis is an endergonic process.
Photosynthesis is an endothermic reaction since it uses energy. This energy comes from light, most often from sunshine. The process transforms the electromagnetic energy of the sun into hydrogen gas, which is subsequently kept in the plant through chemical bonds. On Earth's surface, sunlight serves as the main energy source. Plants use their leaves to capture light energy during photosynthesis. Water and carbon dioxide are converted by plants into a sugar known as glucose using the power of the sun. Plants use glucose as a source of energy and to create other compounds like starch and cellulose. Because they are autotrophs, plants make their own nourishment. Using photosynthesis, they convert water, sunlight, as well as carbon dioxide into oxygen and simple sugars that the plant consumes as fuel.
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considered efferent nerves; transmit impulse away from neural cell body in cns to stimulate a target muscle, organ, or gland
These are majorly motor nerves.
Efferent nerves and afferent nerves are the two primary types of nerves found in the peripheral nervous system of vertebrates.The efferent nerves are the nerves responsible for transferring nerve impulses out from the central nervous system. They deliver impulses to the organs and muscles.Efferent nerves include motor nerves, which are composed of a series of motor neurons. They supply muscle innervation and come from the spinal cord. They take in central nervous system impulses and use the effector to trigger the proper reaction.The motor neurons' health or injury would impact how muscles move.Therefore, motor nerves are responsible for signal transduction and stimulation of targeted muscle, organ or gland.
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would administration of a drug formulation with clavulanic acid as its only active ingredient combat a bacterial infection? why or why not?
No, the administration of a drug formulation with clavulanic acid as its only active ingredient would not combat bacterial infection.
Clavulanic acid is a beta lactum drug that acts as an inhibitor. It has a fairly weak antibiotic property. That means a drug that only has clavulanic acid as its only active ingredient won't be able to combat any bacterial infection.
Clavulanic acid can be combined with other drugs, such as amoxicillin. When combined with amoxicillin, it can combat bacterial infection pretty effectively. Amoxicillin degrades the bacteria by inhibiting cell wall synthesis and weakening them, while clavulanic acid prevents the inactivation of amoxicillin by binding to the active site of the enzyme that is related to beta-lactamases. This drug combination is used to treat sinus, UTI, and many other bacterial infections.
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There is a certain grammar to the genetic code, or rules to follow so that the message can be effectively translated from DNA into functional protein. Codons are y base "words" that code for specific amino acids. They are and never the words. Reading Frame T6] G G A Cl Isi UAU UIA HA NA strand 3' There is a certain grammar t0 the genetic code;or rules t0 follow So that the message can be effectively translated from DNA into functional protein Te d Codons are base words" that code for specific amino hcids. They are and never the words: on DONB'
Of signs, words, messages sent by code, or other noises. Short sentences, words, or syllables used in standardized articulation tests provide a measurement
At specific locations on the DNA known as replication origins, a protein complex called a DNA helicase attaches to the DNA. The genetic code's base substitution symmetry predicts 2' or 3' REFERENCE WORDS: Photoionization, R-matrix, Cross section, and ion that resembles beryllium Participants read 54 genuine words ending in /a, e, o/, with either final /e/ or /o/, to determine which final form best fits the complete framework for orthogonal polynomials. An Integrative Molecular Biology Kinetic Formalism: appearance in The words themselves can be anything from a collection of consensus amino acid sequences
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the eye has several structures to facilitate sight. which structure serves as the mucous membrane lining of the eyelids?
The mucous membrane that lines the eyelids is the conjunctiva.
The eye is a sensory organ that functions to provide vision. Based on the anatomical structure, the eye is divided into 3 layers, which consist of the outer layer of the cornea and sclera, the uvea in the middle, and the retina in the deepest layer. When looking at an object, the extraocular muscles voluntarily move the eyeball to find the object.
The conjunctiva itself is a part of the eye in the form of a thin layer which functions to protect the eyeball and contains blood vessels to provide nutrition to the membrane. The conjunctiva protects the eye by producing mucus and tears which will block bacteria or foreign objects from entering the eye. The conjunctiva also causes the eyelids to move easily.
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2. Which statement best describes an event that contributes to the production of ATP?
A. Pyruvic acid is broken down to form carbon dioxide.
B. Oxygen molecules are broken down and converted into pyruvic acid.
C. High-energy electrons are passed to NAD+ forming NADH.
D. Carbon atoms in glucose are transformed into energy in the form of ATP.
Answer:
Explanation:
The raw materials for a model summarizing cellular respiration is ; ( B ) Glucose and oxygen.
The statement that best describes an event in the model which contributes to ATP production is ; ( D ) carbon atoms in the glucose are transformed into energy in the form of ATP
Cellular respiration is a set of metabolic reactions whereby the cells in an organisms take in oxygen and converts glucose found in the cells into ATP ( emergy ) needed by the organisms. while carbon dioxide and water is given out as a by product in the process. while
During ATP production the carbon atoms in the glucose are transformed into energy in the form of ATP
Hence we can conclude that The answer to your questions are B and D
what is the general relationship between species richness and ecosystem function and resilience to disturbances? and, why?
The mechanism of cohabitation shapes the link between species richness and ecosystem variability. theory linking environmental diversity to species richness.
What distinguishes species diversity from species abundance?The number of members of each species in a region is known as its species abundance. Additionally, it has a numerical quality. The phrase "species diversity" refers to the variety of species present in a region (also known as "species richness"), as well as their abundance and distribution within that ecosystem. It serves as a gauge of the ecosystem's diversity.
Does the functioning of an ecosystem at the landscape scale depend on species richness?The association between species richness and ecosystem functioning may thus generally be stronger at the landscape size than at lower ones, according to our findings.
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which structure is correctly paired with its function? question 38 options: urethra: transport of urine bladder: concentration of urine nephron: storage of urine ureter: formation of urine
Urine is carried by the urethra.
Urine travels from the kidneys to the bladder through the ureters. Prior to passing through the urethra and leaving the body, the urine is stored in the bladder. the pipe connecting the kidney to the bladder to transport pee.
Urethra. Urine can travel through this tube and leave the body. Urine leaks from the bladder as a result of the brain's tightening signal to the bladder muscles. In order to allow urine to pass from the bladder through the urethra, the brain sends a signal to the sphincter muscles to loosen up.
The urinary bladder serves as a temporary reservoir for the pee and is reached by the ureters, which transport urine from the kidneys. The urinary bladder's urine is transported to the outside by the urethra, a tubular organ.
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The female peacock is less colorful and has a shorter tail than the male. Explain, in evolutionary terms, the advantage that the bright coloration and elaborate tail feature give the male.
Answer:
The bright coloration and elaborate tail feature of the male peacock are thought to be examples of sexual selection. Sexual selection is a type of natural selection that occurs when certain traits are favored by members of one sex (usually females) when choosing a mate. These traits are often exaggerated or highly visible, and they serve to attract the attention of the opposite sex.
Answer:
In many species, including peacocks, males tend to have more colorful and elaborate physical features than females. This is often referred to as sexual dimorphism. One theory for the evolution of these differences is that they function as a form of sexual selection, in which the more attractive or ornamented individuals are more likely to attract mates and reproduce.
In the case of peacocks, the bright colors and elaborate tail feathers of the male may serve as a visual display that attracts females and signals the male's fitness and genetic quality. The bright colors and elaborate tail may also serve as a way for the male to advertise his presence to other males and potentially deter them from competing for the same females.
Overall, the bright coloration and elaborate tail of the male peacock may have evolved as a way for males to stand out and attract mates, which can increase their reproductive success.
I really need help on this question
Explain 3 differences between the leading strand and the lagging strand
Answer:
pls rate as brainliest
Explanation:
DIFFERENCES
the lagging strand replicates discontinuously forming short fragments, whereas the leading strand replicates continuously .The extension of the leading strand from primer by the action of DNA polymerase occurs without any interruption. lagging strand involves its formation into segments.Leading strand does not involve any activity of DNA ligase for its formation. lagging strand is formed by the activity of ligaseWhat i the proper term for the repeated erie of event by which rock gradually and continuouly change from one type to another
The term "rock cycle" refers to the process by which molten magma cools and transforms into an igneous rock.
What do rocks become as a result of weathering and erosion?At or near the earth's surface, weathering (the process of breaking down rock) and erosion (the process of transferring rock material) reduce rocks to ever-tinier fragments. These more minute rock fragments, such as sand, silt, or mud, can be deposited as sediments, which then harden or lithify to form sedimentary rocks.
What kinds of weathering do rocks undergo?Weathering can be classified as biological, chemical, or mechanical. Chemical weathering is the process by which rain gradually eats away at rocks because rain is actually somewhat acidic. Animals and plants can also degrade rocks.
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the enzyme dna covalently links nucleotides to synthesize new dna strands together during dna replication. t or f
The assertion is true. During DNA replication, the enzyme DNA Polymerase covalently joins nucleotides to create new DNA strands.
Semi-conservatism applies to DNA replication. The double helix's strands serve as models for the creation of new, complementary strands. DNA polymerases, which require a template and a primer (beginning) and synthesise DNA in the 5' to 3' orientation, are the enzymes responsible for creating new DNA.
Only strands or primers of DNA or RNA that are base paired with the template can have nucleotides added to them by the DNA synthesis enzyme, DNA polymerase. The covalent binding of the incoming nucleotide to the primer requires the enzyme DNA polymerase.
Therefore, we can conclude that the proposition is accurate. During DNA replication, the enzyme DNA Polymerase covalently joins nucleotides to create new DNA strands.
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8.What type of eruption produces a viscous magma containing 52% silica and a gas
content of 1.5%?
Answer:
A viscous magma containing 52% silica and gas would produce a felsic, or explosive, eruption. Felsic eruptions typically produce lava flows that are thick and sticky, and can contain a high concentration of silica. These eruptions can also produce large ash clouds and pyroclastic flows, as the gas trapped in the magma expands and escapes during the eruption. Examples of felsic volcanic eruptions include the eruption of Mount St. Helens in 1980 and the eruption of Mount Pinatubo in 1991.
methotrexate is a highly toxic medication that blocks dna synthesis in all cells. what medication needs to be administered after methotrexate to prevent cytotoxic effects in normal cells of the body?
Methotrexate is a highly toxic medication that is used to treat a variety of conditions, including cancer. It works by blocking DNA synthesis in all cells, which can be beneficial in treating cancer, but can also have detrimental effects on normal cells of the body. To prevent the cytotoxic effects of methotrexate on normal cells, a medication known as leucovorin or folinic acid must be administered after methotrexate.
Leucovorin or folinic acid acts as a “rescue” agent to reduce the toxicity of methotrexate, as it enables normal cells to continue their normal DNA synthesis. Unlike methotrexate, leucovorin does not block DNA synthesis, but rather helps to restore the activity of an enzyme known as dihydrofolate reductase. This enzyme is essential for normal DNA synthesis and is inhibited by methotrexate, but it can be “rescued” by leucovorin, allowing normal cells to escape the cytotoxic effects of methotrexate.
Administration of leucovorin or folinic acid is essential for reducing the cytotoxic effects of methotrexate on normal cells. It is typically administered after methotrexate to help restore the activity of dihydrofolate reductase and to prevent the cytotoxic effects of methotrexate on normal cells. If leucovorin or folinic acid is not administered, the toxic effects of methotrexate on normal cells can be significant and cause serious health complications.
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A vine plant brushes against a fence and wraps itself around the fence. to what stimulus is the plant responding?
Plant grows toward the direction of sunlight to stimulus is the plant responding.
Two different kinds of induced curvature motions are visible in plants. These movements are specifically tropic and nastic. Tropic movements are directional growth patterns in which the stimulus's direction determines the growth's direction. Examples include gravitropism, gravitropism, chemotropism, phototropism, and others. Positive tropism, or the movement of growing plants toward a stimulus, is distinguished from negative tropism, or the movement of growing plants or plant components away from a stimulus. Instead of downward and upward tropism, positive or negative tropism is the definition of a tropic movement.
Light, gravity, water, sun movement, and touch are a few common stimuli for plants. The stimulus is linked to the naming of the tropism. For instance, hydrotropism refers to the root movement of plants toward water.
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the most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon. t or f
Yes, it is true that rayon, which is made from cellulose and primarily comes from plants, is the most popular type of regenerated fiber.
The most popular kind of regenerated fiber is rayon, which is made from cellulose and is primarily plant-based. Cellulose-based fibers are synthetic polymer fibers, which all have a petroleum-based beginning. While polyester shares many characteristics with nylon, it is more easily dissolved by weak and concentrated acids.
Dietary fibers are often composed of lengthy, repetitive chains of carbohydrates and are generated from indigestible plant components. The insoluble fibers cellulose and lignin can be found in cereal and grain husks, which are where the majority of fibers come from. Cellulose makes up the majority of plant fibers, frequently in conjunction with other substances like lignin. Cotton, hemp, jute, flax, ramie, sisal, and bagasse are a few examples.
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if a typical somatic cell has 12 chromosomes, how many chromatids and dna molecules are expected in each cell of that organism?
12 DNA molecules and the 24 chromatids will be in each cell of that organism.
How does DNA function? What is it?The instructions required for a creature to grow, endure, and reproduce are encoded in its DNA. Dna fragments must be transformed into messages that are utilized to create proteins, that are the protein complexes that carry out the majority of the tasks in our bodies, in order to complete these activities.
Why is DNA such a big deal?DNA is crucial for inheritance, protein coding, and supplying guidelines for life and its functions in all living organisms. DNA controls a person's or an animal's growth, reproduction, and final demise. There are 46 chromosomes in total in each of a human cell's 23 pairs of chromosomes.
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apoptosis is a term describing the process by which cells stop dividing and die. it is a normal part of an organism’s life cycle. apoptosis is carefully controlled by enzymes within the cell. what would happen if the genes used to synthesize these enzymes were mutated?
Enzyme mutations, which are the result of inherited anomalies in the affected person's DNA, can cause serious or fatal illnesses in humans. An enzyme that is encoded by a mutant gene may only have one aberrant amino acid residue at a particular location.
Some mutations force material via the faulty metabolic pathway by increasing the expression of the enzyme upstream of the weak-link enzyme. Others promote the synthesis of a co-substrate for a downstream enzyme, moving more substance through the route. Genetic mutations, which occur as your cells divide and generate duplicates of themselves, are modifications to your DNA sequence. Your DNA teaches your body how to develop and work.
Genetic changes may result in diseases like cancer or, in the long run, may enable people to adapt to their environment more successfully. The process of programmable cell death is called apoptosis. Unwanted cells, such as those between a developing hand's fingers, are removed during the early stages of development. Adult bodies employ apoptosis to get rid of cells that can no longer be repaired.
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as noted in our origins, this modern human population exhibits the greatest genetic diversity today?
sub-Saharan Africans human population exhibits the greatest genetic diversity today.
sub-Saharan Africans
Geographically speaking, Sub-Saharan Africa refers to the parts of the African continent south of the Sahara. West Africa, East Africa, Central Africa, and Southern Africa are among them.
Geographically, according to the United Nations definition, the term may also cover polities that only have a portion of their territory located in that region, in addition to the African countries and territories that are totally situated in that particular region (UN). According to the organization defining the region, there are between 46 and 48 countries included in this non-standard geographical area (e.g., UN, WHO, World Bank, etc.). The African Union, which recognizes all 55 of the continent's Member States, divides them into five clearly defined regional groups.
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Suppose you start with two segments of DNA (two different genes). Each one of these two will codify for a specific set of amino acids. The two genes’ sequences are provided below, please show all the steps to get to the correct amino acids. Gene 1: GACAAGTCCACAATC – Gene 2: ATTGCAATCCGG
Hint: you need to use the Genetic Code table from lesson 5.10, Explore: The Genetic Code page 12. Make sure to follow the steps of protein synthesis: from DNA to mRNA to amino acids.
( needs to be 2 paragraphs)
Converting the genes to mRNA and using the table of genetic codes:
Gene 1: Leu Phe Arg Cys (stop codon)
Gene 2: (stop) Arg (stop) Ala
The genetic codesThe genetic codes, otherwise known as codons, are codes containing 3 nucleotide bases with each code specifying an amino acid. The nucleotide bases are mRNA bases.
Thus, for each gene, the mRNA bases would be the complementary bases.
GACAAGTCCACAATC = CUGUUCAGGUGUUAGATTGCAATCCGG = UAACGUUAGGCCUsing the genetic code table:
For the first mRNA sequence: CUG UUC AGG UGU UAG
Leu Phe Arg Cys (stop codon)
For the second mRNA: UAA CGU UAG GCC
(stop) Arg (stop) Ala
In other words, the amino acid for the first gene would be Leucine, Phenyline, Arginine, Cysteine, and a stop codon.
For the second gene, the amino acids would be a stop codon, Arginine, a stop codon, and Alanine.
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what is the probability that a mating between two carriers will produce an offspring with a recessively inherited disorder
There is a 25% probability that a mating between two carriers will produce an offspring with a recessively inherited disorder.
Inorder to understand the probability of mating between two carriers, we need to form a punnet square. In the field of biology, a punnet square is a diagram that shows the probability of outcomes when mating is done between two prospect parents.
Consider two carrier mates to be Hh and Hh. The punnet square will be drawn as:
H h
H HH Hh
h Hh hh
The results of the punnet square show that there is 25% probability for the recessively inherited disorder to occur. 50% probability is there for the offspring being carriers like the parents and 25% probability is that there will be no disorder in the offspring.
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the stage of the cell cycle where each chromosome is composed of two chromatids in preparation for mitosis is called phase____.
The stage of the cell cycle where each chromosome is composed of two chromatids in preparation for mitosis is called phase S.
Each chromatid was duplicated as a result of S. The sister chromatids are still referred to as one chromosomes since they have a single centromere. The cells are in G2 and getting ready for M when finished.
phase S. The cell creates a full copy of the DNA in its nucleus during the S phase. Additionally, it makes duplicates of the centrosome, a structure that organizes microtubules. During M phase, the centrosomes aid in the separation of DNA.
A normal diploid somatic cell enters S phase with a 2N complement of DNA and ends it with a 4N complement of DNA. S phase is a period of extensive DNA synthesis during which the cell replicates its genetic material.
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a child of a parent with a mutation in collagen and displaying oi will have what probability of also having oi?
A child of a parent with a mutation in collagen and displaying oi will have the probability of 50% having oi. A genetic disease called osteogenesis imperfects (OI) results in recurring bone fractures with little to no obvious stress.
Another name for mutation OI is "brittle bone disease." OI can be mild or severe, and the latter might result in death either before or soon after birth. Adults with OI may experience dental issues, hearing loss, dentinogenesis imperfects, and fractures. Patients with OI may also experience skeletal anomalies, joint laxity, and muscle weakness.
One in 20,000 people have OI, including those who are diagnosed with it later in life. OI affects persons from all racial and cultural backgrounds, as well as males and women equally frequently.
The complete question is:
A child of a parent with a mutation in collagen and displaying oi will have what probability of also having oi? 25% 50% 75% 100%
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Which of the statements is a correct description of the role of enzymes in catalyzing biochemical reactions?
Enzymes provide the necessary activation energy to reach the transition state.
Enzymes decrease the ΔG of reactions, making them proceed rapidly.
Enzymes increase the ΔG of reactions, making them proceed rapidly.
Enzymes stabilize the transition state and decrease its free energy.
"Enzymes stabilize the transition state and decrease its free energy" is correct about the role of enzymes.
Enzymes are proteins that act as biological catalysts with the aid of accelerating chemical reactions. The molecules upon which enzymes may also act are known as substrates, and the enzyme converts the substrates into distinct molecules known as products.
Enzymes are crucial for digestion, liver function, and much more. An excessive amount of or too little of a sure enzyme can reason fitness issues. Enzymes in our blood can also assist healthcare carriers to check for injuries and sicknesses.
Characteristics of enzymes:
* Enzymes are complicated macromolecules with a high molecular weight
* They catalyze biochemical reactions in a cell.
* Enzymes have an effect on the rate of biochemical response and not the direction.
* Enzymes are unique in movement.
* Enzymatic activity decreases with growth in temperature.
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what is the difference between structural support in plant and mechanical support in plant
The structural support of the plant is provided by the cellulose embedded in the cell wall while the mechanical support is provided by collenchyma cells.
How is the plant supported structurally?Plant structural support is the permanent deposition of polymers such as lignin or cellulose in cell walls to maintain the shape of the plant and its cells.
Cellulose is an important structural component of the cell walls of plant cells. Cellulose provides structural rigidity and tensile strength to these cells. Cellulose is made from many covalently-linked glucose monosaccharides.
Collenchyma cells have thick walls that are especially thick at their corners. These cells provide mechanical support for the plant.
Collenchyma is a living, elongated, mechanical and flexible ground tissue with angular pectin depositions; present just under leaves, tendrils and stems of climbers; formed before vascular differentiation.
The major difference between the mechanical support and structural support can be found mentioned above.
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7 which statement indicates that different parts of the genetic information are used in different kinds of cells, even in the same organism? select one: a. offspring have a combination of genes from both parents. [2] b. replicated chromosomes separate during gamete formation. c. the cells produced by a zygote usually have different genes. d. as an embryo develops, various tissues and organs are produced.
The correct statement which describes different parts of the genetic information are used in different kinds of cells is b)replicated chromosomes separate during gamete formation. So, correct option is b.
Mendel suggested that matching and partition of a couple of chromosomes at the hour of gamete development will prompt isolation of sets of elements as variables are conveyed by chromosomes. Thus, they demonstrated Mendel's law of isolation that expresses that elements controlling a person separate during gamete development.
The information on chromosomal development and isolation was joined with Mendelian standards and this was called chromosomal hypothesis of legacy. Partition of the sets of chromosomes at the hour of gamete development neither outcomes in the arrangement of zygote nor influences the cycle. The development of zygote happens when the male gamete wires with the female gamete.
Hence, correct option is b.
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A student placed 20 tobacco seeds of the same species on moist paper towels in each of two petri dishes. Dish A was wrapped completely in an opaque cover to exclude all light. Dish B was not wrapped. The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and the opaque cover was permanently removed from dish A. Both dishes were returned to the light and examined again at 14 days. The following data were obtained. Additional observations were made on day 21, and no yellow-leaved seedlings were found alive in either dish. This is most likely because: ________
This is most likely because the tobacco seeds required light in order to germinate, and the opaque cover prevented the seeds in Dish A from receiving any light.
The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and by the time the cover was removed on day 7, the seeds in Dish A were already too far behind in their development, as the seeds in Dish B had been receiving light for 7 days and had already begun to germinate.
By day 14, the seeds in Dish A had not had enough time to catch up to the seeds in Dish B, and so none of the yellow-leaved seedlings survived in either dish.
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