Answer:
a. none
b dihybrid and trihybrid crosses (both)
c. trihybrid cross
d. none
e. dihybrid cross
Explanation:
A dihybrid cross can be defined as a mating experiment between two different varieties/lines that differ in two observed phenotypic traits, while a trihybrid cross is a cross between two varieties/lines that differ in three traits. For example, Mendel crossed two pea plants that differed in seed color (yellow and green) and seed shape (wrinkled and round). Mendel's experiments consisted of dihybrid and trihybrid crosses for different phenotypic traits. From these mating experiments, he observed dihybrid F1 plants produced 9:3:3:1 ratio of phenotypes in the F2 generation.
Biology I Mid-Year-Assessment (2020-2021)
In hamsters, black fur (B) and white fur (W) are co-dominant. A scientist finds a record of offspring for a mated pair of
hamsters. The record shows 50% of the offspring had black and white fur and 50% of the offspring had white fur. None of
the offspring had black fur only. Which parental cross was most likely responsible for the percentages of offspring fur color
the scientist found?
A. BW x WW
B. BW x BW
C. BB x WW
D. BW x BB
Answer:A. BW x BB
Explanation:
The parental cross that was most likely responsible for the percentages of offspring fur color, the scientist found, BW x WW. The correct option is A.
What is crossing?The exchange of genetic material between non-sister chromatids of homologous chromosomes occurs during crossing over, an enzyme-mediated process. It happens during meiotic prophase I's pachytene stage.
When chromosomes of the same type are paired together during meiosis, a biological event called crossing over takes place.
Parts of the chromosome can be exchanged when two chromosomes, one from the mother and one from the father, line up. The same genes may be present on the two chromosomes in different versions.
Therefore, the correct option is A. BW x WW is the result of the crossing over of offspring for a mated pair of hamsters.
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A Class-A 10 mL pipette is supposed to dispense 10.00 mL of water. A lab technician makes three measurements of the volume that the pipette actually dispenses, and obtains volumes of 9.70 mL, 9.69 mL, and 9.71 mL. The pipette is:__________
a) Accurate, but not precise
b) Precise, but not accurate
c) Accurate and precise
d) Neither accurate or precise
Answer:
d) Neither accurate or precise
Explanation:
Accuracy and precision are critical factors in the experimental procedure. Accuracy can be defined as the amount of uncertainty in the process of measurement in relation to the true value (in this case, 10 mL). On the other hand, precision is an independent feature of the accuracy which indicates the repeatability of the measurement process (in this case, three measures weren't repeated). Therefore, precision indicates the confidence of a particular measurement, while accuracy indicates how close is this value to the real value.
how those a living organism obtain energy from eating food
Answer:
Their cells are able to turn sunlight into food through a process called photosynthesis. In photosynthesis, producers combine carbon dioxide, water, and sunlight to produce oxygen and sugar (their food). Other organisms get energy by eating producers. ... It cannot directly use the Sun's energy to make food.
Explanation:
Answer: Their cells to turn sunlight into food through a process called photosynthesis. In photosynthesis producer combine carbon dioxide water, and sunlight to produce oxygen and sugar (tandem then makes there food).
Explanation:
Hope this helps
How do woollen clothes keep us warm?
Answer:
wool hair fibres act as an insulator to trap the air inside the cloth, which helps stabilise your body temperature.
Water and food are both examples of _____ factors.
A .limiting
B. abiotic
C. carrying
D. biotic
Answer:
D
Explanation:
Biotic factors-all the influences that organisms in the community have on each other
Which physical and behavioral characteristics do you think distinguished humans from other primates?
Answer:
Give me answer choices then I can help you
Explanation:
5. What gametes are produced by the following organisms: a. Genotype YyRr, if Y and R are on different chromosomes b. Genotype YyRr, if dominant Y and R are on the same chromosome, no crossing over c. Genotype YyRr, if dominant Y and recessive r are on the same chromosome, no crossing over d. Genotype YyRr, if dominant Y and R are on the same chromosome, 50% crossing over
Answer:
a) YR, Yr, yR, yr
b) YR, yr
c) Yr, yR
d) YR, yr, Yr, yR
Explanation:
Before gametes are formed, during anaphase sister chromatids separate and migrate to the poles. Following the low of segregation and independent assortment, alleles from the same trait and from different traits separate independently from each other. During this separation, there might be different gene combinations according to their position in the chromosome, the occurrence of crossing over, and the destiny of each chromatid.
a. Genotype YyRr, if Y and R are on different chromosomes
Genes are located in two different chromosomes, which means that there might be four possible gametes.
YR, Yr, yR, yrb. Genotype YyRr, if dominant Y and R are on the same chromosome, no crossing over
Genes are located in the same chromosome, which means that there might be two possible gametes.
YRyrc. Genotype YyRr, if dominant Y and recessive r are on the same chromosome, no crossing over
Genes are located in the same chromosome, which means that there might be two possible gametes.
YryRd. Genotype YyRr, if dominant Y and R are on the same chromosome, 50% crossing over
The fact that there is 50% crossing over means that these genes are not linked. There are four possible gametes
YR (parental)yr (parental)Yr (recombinant) yR (recombinant)Explain why countercurrent flow met the goals and why parallel flow did not meet the goals.
Answer:
Countercurrent flow met the goals due to difference in concentration gradient.
Explanation:
Countercurrent flow met the goals because it flows in opposite direction while on the other hand, parallel flow did not meet the goals because it flows in the same direction. For example. the blood flows in one direction and the dialysate flows in the opposite direction. The countercurrent flow of the blood and dialysate increases the concentration gradient between the blood and dialysate. The increased gradient helps to remove more potassium, phosphorus and urea from the blood. If we used parallel flow so less concentration gradient of solutes is present and hence, less potassium, phosphorus and urea are removed from the blood
In fluid or a flowing body when there is interexchange or a crossover of some fluids with each other is called countercurrent flow while when the fluid flows in the same direction then it is called parallel flow.
Countercurrent meets goals because of concentration gradient differences.
Countercurrent and parallel flow can be explained as:The goals are met in countercurrent because of the opposite direction while in parallel they are not achieved because of the same direction.Countercurrent flow in fishes helps them to increase the blood oxygen level from water as this system help them efficiently maximize the oxygen needed for respiration.If the parallel flow is used then the concentration gradient would be less and hence less oxygen will be available from the water to fishes.Therefore, countercurrent achieves its goal while parallel dies not.
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which acid is used to produce chloride salt
Answer:
Different acids make different salts.
Explanation:
a hydrochloric acid
b sulphuric acid
c nitric acid
PLEASE HELPPP!! ILL GIVE BRAINLIEST AND 10 POINTS!!
The ocean floor is not entirely flat, but has mountains and valleys. How did they get there?
Explain your answer.) (4 - 7
sentences to fully answer the
question.)
Answer:
In all kinds of storms the coriolis effect cause the movement of water in the uppermost parts of the ocean also known as the ekman layer to create hills and valleys in the ocean topography or shape. Counterclockwise winds cause surface water to move to the right and away from a central point causing a sea surface valley. Clockwise winds cause surface water to move to the right and toward the central point causing a sea surface hill. Thats all i know i hope i helped
Explanation:
Do you feel land is an
important resource to
govern and protect?
Answer:
Yas queen
Explanation:
OF COURSE!
WE NEED TO STOP POLLUTION PLSS
Why might it be important for population ecologists to know the factors that allowed the population to grow at exponential rates?
because they think they be cool with popularity when they look like fools
How did economics delay scientists' first attempts for conservation in each story?
The correct answer to this question is the following.
Unfortunately, your question is incomplete. You did not attach the two stories. So we do not know what the topic is. You also forgot to attach a link or the title of these stories.
However, trying to help you we did some deep research and can comment on the following.
There are two stories about Conservation Activity. One is about "Using Forest Wisely" and the other is about "Community Conservation."
If that is the case, we can say that the economics delay scientists' first attempts for conservation affect the conservation study and the environment in that cutting those trees for economic purposes directly impact the wildlife and nature of the region.
Trees are the sentient beings that produce the oxygen human beings need to breathe fresh air. They clean the air because trees "breathe" carbon dioxide. The uncontrolled cutting down of trees could affect because resources could be scarce, increasing prices of goods.
One of the stories refers to the case of gorillas in places such as Rwanda or Uganda, risking the habitat of these animals and the entire environment of those forests, which also results in affecting the economy of the places.
Propose an explanation for why humans have experienced exponential growth since the Industrial Revolution? (why was our population able to live longer and reproduce more successfully). What do we have access to now that was nonexistent or difficult to access in the past?
Answer:
The Industrial revolution increased chances of survival for human due to technology and increased ways to get food
Explanation:
The human population of the planet increased gradually for more than 10,000 years after the Agricultural Revolution. As the population continues to grow, competition for resources will increase. Natural disasters and political conflicts will exacerbate the problems, especially in the more stressed regions of developing nations. The survivors of this competition will likely be determined by factors such as place of birth and educational opportunities.
What protects the outer layer of all the cells
2.
Which two of the following structures are found in both prokaryotic and eukaryotic cells?
ribosomes
© vacuole
O cell membrane
® Golgi bodies
O nucleus
E endoplasmic reticulum
Using this passage, fill in the blank with either G1, G2, or G3. (1) All dogs are mammals. (2) All mammals are things with hair. Therefore, (3) All dogs are things with hair. (1) All _____ are _____. (2) All _____ are _____. Therefore, (3) All _____ are _____. Question 5 options: Blank
Answer:
Given the values for G1, G2, and G3, the blank spaces are filled below.
Explanation:
Assuming that
G1 = dogs
G2 = mammals
G3 = things with hair
Then
(A) All G1 are G2
(B) All G2 are G3
(C) Therefore, all G1 are G3
In which situation would being genetically
identical to the parent be an advantage
for an organism?
Answer:
Explanation:
Two offspring cells with the same genetic material as the parent cell. Two offspring cells with half genetic material as the parent cell
Protein markers react with specific ______, which are proteins found in the immune system.
A. antigen
B. immunity
C. antibody
D white blood cells
Protein markers react with specific antibody, which are proteins found in the immune system.
What is protein?
Proteins are large micromolecules and macromolecules that comprise one or more long chains of amino acids.
Proteins found in immune systemThe major proteins found in the immune system are cytokines, antibodies, and complement proteins.
Thus, Protein markers react with specific antibody, which are proteins found in the immune system.
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If it takes a frog 5 minutes to jump 3 blocks, how long will it take for him to jump 15 blocks?
Answer: It will take the frog 25 minutes.
Explanation:
What is the role of helicase in DNA replication?
Answer:
The helicase is essential because they separate the double-stranded DNA into single strands so that it could be copied.
Hoped this helped!
An atom of hydrogen consists of one
surrounded by one
proton, neutron
neutren, praten
preten, electron
neutron, electron
Answer:
Ann atom of hydrogen consists of one proton surrounded by one electron
Answer:
its C I believe
Explanation:
Genes that are close enough to each other on the bacterial chromosome to be contransformed are said to be linked.
a. True
b. False
Answer: True
Explanation:
Genes are simply referred to as the unit of hereditary. It should be noted that the genes consist of DNA.
The statement that genes which are close to each other on the bacterial chromosome that is to be contransformed are said to be linked is true.
Therefore, the answer is true.
What was happening in history when this mutation took off in parts of Europe and Africa?
PLEASE SOMEONE HELP ME I’M REALLY STRUGGLING
Answer:seventy-seven thousand years ago, a craftsman sat in a cave in a limestone cliff overlooking the rocky coast of what is now the Indian Ocean. It was a beautiful spot, a workshop with a glorious natural picture window, cooled by a sea breeze in summer, warmed by a small fire in winter. The sandy cliff top above was covered with a white-flowering shrub that one distant day would be known as blombos and give this place the name Blombos Cave.
Explanation:
Give examples of three paramedic plants
Answer:
In other side there are 10 common medicinal plants
lavendarthymemintaloe vera basilsunflowers e.t.cExplanation:
hope it helps you ^^
Goats can either be polled or horned. The pulled, or no horn, trait (P) is dominant to the horned (p) trait. Another trait in goats are wattles, which are hair covered structures on their necks. Even though most goats do not have wattles, having wattles (W) is dominant to not having wattles (w). A breeder crosses a polled, wattled male goat with a polled, wattled female goat. Some of the offspring have horns and no wattles. Perform a cross of the parental genotypes to find the phenotypic ratios of the offspring.
Answer:
Pulled and wattled = 9/16
Pulled and no wattle = 3/16
horned and wattled = 3/16
horned and no wattle = 1/16
Explanation:
Pulled = P, Horned = p
Wattled = W, no wattle = w
Polled, wattle goats = P_W_
Since they produced offspring with horns and no wattles (ppww), it means both parents have the recessive allele for each trait. Hence, they are both heterozygotes with PpWw as genotypes.
PpWw x PpWw
Genotypes ratio of the offspring:
P_W_ - 9/16
P_ww - 3/16
ppW_ - 3/16
ppww - 1/16
Phenotype ratio of the offspring:
Pulled and wattled = 9/16
Pulled and no wattle = 3/16
horned and wattled = 3/16
horned and no wattle = 1/16
(See the attached image for the Punnet's square)
Some alleles of a gene are dominant to others masking the effect this other alleles.
The polled, or no horn, trait (P) is dominant to the horned (p) trait.
Having wattles (W) is dominant to not having wattles (w).
A breeder crosses a polled, wattled male goat with a polled, wattled female goat.
The phenotypic and genotypic ratios would be
Polled and wattled = P_W_ = 9/16Polled with no wattle = P_ww = 3/16horned and wattled = ppW_ = 3/16horned with no wattle = pwpw = 1/16Parent genotype --- polled, wattled male and female goat -- P_W_
As the cross produced offspring with horns and no wattles (ppww), it shows both parents have the recessive allele for each trait.
Hence, they are both heterozygotes with PpWw for the traits.
Parent genotypes: PpWw x PpWw
PW Pw pW pw PW Pw pW pw
PW Pw pW pw
PW PPWW PPWw PpWW PpWw
Pw PPWw PPww PpWw Ppww
pW PpWW PpWw ppWW ppWw
pw PpWw Ppww ppWw ppww
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when white light passes throught a prism, what can be discovered?
Answer:
Isaac Newton's 1666 experiment of bending white light through a prism demonstrated that all the colors already existed in the light, with different color "corpuscles" fanning out and traveling with different speeds through the prism.
Answer:
a rainbow!
Explanation:
Do humans have an open or closed circulatory system? Explain.
Answer:
Explanation:
Organisms have different forms of circulatory systems. Humans have a closed circulatory system, while many mollusks and other invertebrates have an open system. In a closed circulatory system, blood is enclosed within blood vessels.
Which of the following is an example of two organisms competing for an abiotic factor?
A. Two different species of insects
competing for leaves from trees
B. Two different species of
mammals competing for small
rodents to eat
C. Two different species of birds
competing for berries to eat
D. Two different species of
mammals competing for the
same water source
Two different species of mammals competing for the same water source is an example of two organisms competing for an abiotic factor.
What is abiotic factor?
Abiotic factors refers to non-living physical parts of the environment that affect living organisms as well as the functioning of ecosystems. In the above example, water source is a non-living part of an ecosystem which is required by both organisms.
This leads to competition of two mammals so we can conclude that two different species of mammals competing for the same water source is an example of two organisms competing for an abiotic factor.
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Melissa tested how fast sound waves travel through different media. She then ordered the speed at which the sound traveled through each medium from fastest to
slowest. Which data table represents the correct order that the sound waves traveled from fastest to slowest?
Fastest Speed
Medium Speed
Slowest Speed
steel
air
water
Fastest Speed
Medium Speed
о
Slowest Speed
water
air
steel
Fastest Speed
Medium Speed
Slowest Speed
O
steel
water
air
Fastest Speed
Medium Speed
Slowest Speed
air
steel
water
Fastest Speed: Steel
Medium Speed: Water
Slowest Speed: Air