Down syndrome in humans is due to ________ of the 21 st chromosome.
Answer:
Down syndrome in humans is due to ADDITIONAL, PARTIAL OR FULL COPY of the 21 st chromosome.
Explanation:
Down syndrome is a genetic disorder in which an individual has a total of 47 chromosomes instead of 46 that is, 23 pairs of chromosomes which is found in normal individuals. This occurs as a result of the presence of additional, partial or full copy of chromosome 21. There are generic variations that occurs in chromosome 21 leading to down syndrome, these include:
-->Trisomy 21 : the individual has three copies of chromosome 21 instead of two copies due to abnormal cell division that occurred during development of sperm or egg.
--> Mosaic Down syndrome: the individual has some cells with an extra copy of chromosome 21 and it's caused by abnormal cell division after fertilization.
--> Translocation down syndrome: This type of down syndrome occurs when chromosome 21 gets attached to another chromosome which occurs during or after conception.
Generally the symptoms due to the presence of this extra genetic material includes:
--> short heights
--> poor muscle development
--> short neck
--> short fingers with small hands and feet
--> increased risk to development of dementia
--> greater tendency to develop obesity
What is the primary source of energy for all food chains??
Answer:
It is the sun in most ecosystems as the light energy is fixed during photosynthesis and then transferred to other organisms via the food chain.
Explanation:
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The moray eel and grouper fish hunt together. When both hunt together, prey barely stands a chance: hide in the reef, the eel eats you; dash for open water, the grouper grabs you. Which symbiotic relationship is described above?
A. Coevolution
b. Mutualism
c. Parasitism
d. Commensalism
Answer:
We can immediately cross-out C
We can also cross-out A.
Now we have B and D. Commensalism and Mutualism. Now, commensalism is an association between two organisms in which one benefits and the other derives neither benefit nor harm.
Mutualism is the doctrine that mutual dependence is necessary to social well-being.
I would say D: Commensalism. Both fish can survive without each other.
what is the function of cell
Answer:
Cell provide structure and support to the body of an organisms
Answer: They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body's hereditary material and can make copies of themselves. Cells have many parts, each with a different function. brainliest?
Explanation:
Question 5 (2 points)
The moon
around the Earth due to its speed of motion and the pull of
Word Bank:
magnetism revolves
rotates
gravity
Blank 1:
Blank 2:
Submit
Answer: blank 1: rotates
blank 2: gravity
Explanation:
what is the name of the smallest bone in the body and where is it found?
Answer:
The 3 smallest bones in the human body--malleus, incus, and stapes--are located in the middle ear. At 3 x 5 mm in size, the stapes is the smallest bone in the human body.
Answer:
What is the smallest bone in the human body? The 3 smallest bones in the human body--malleus, incus, and stapes--are located in the middle ear. At 3 x 5 mm in size, the stapes is the smallest bone in the human body.
Which of the following is a critical factor driving evolution?
Environmental conditions
Health in comparison to similar organisms
Ability to acquire food
Strength in comparison to similar organisms
All of these are equally important
all of these are equally important, what if there is an option for natural selection, natural selection would be the most important but for this it's all these are equally important.
The critical factor driving evolution is strength in comparison to similar organisms.
According to Charles Darwin, Organisms that are better able to survive in their environment live long enough to reproduce and pass on these favorable traits to their offspring leading to the perpetuation of these organisms and gradual demise of other individuals of the same species who lack these favorable traits.
This is the origin of the cliché, "survival of the fittest". Hence organisms that lack certain strengths possessed by other organisms are gradually replaced by other individuals having such strengths.
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"What do the four genotypes inside the 4 boxes of a Punnett Square represent?
Answer:
They represent the percent chance to inherit a type of genotype. Recessive alleles, dominant alleles, heterozygous have chances to appear based off the parent alleles.
HELP PLZZ?!
What is a region called that is characterized by things like abiotic factors and plant life?
biome
biosphere
ecosystem
estuary
Answer:
Biome
Explanation:
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The sodium-potassium pump:
A. uses energy to move sodium ions out of the cell and potassium ions into the cell.
B. uses energy to move potassium ions out of the cell and sodium ions into the cell.
C. moves sodium ions out of the cell and potassium ions into the cell without using energy.
D. moves potassium ions out of the cell and sodium ions into the cell without using energy.
PLEASE EXPLAIN!
Explanation:
What pigment replaces chlorophyll in
the fall season?
A. carotene
B. betatene
C. hypotene
Answer:
A. Carotene
Explanation:
It is an orange/red pigment which is seen during the fall.
What is the difference between diurnal and nocturnal?
Choose all that apply
Question 8 options:
diurnal means awake during the day, and use the light to their advantage
nocturnal active at night.
nocturnal mean awake during the day, and use the light to their advantage.
diurnal means active at night
Answer:
diurnal means awake during the day, and use the light to their advantage
nocturnal active at night.
Explanation: Diurnal means active during the day, such as a mosquito meanwhile, a nocturnal animal or being is only active during the night, and sleeps the day away, such as a bat
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Diurnal means awake during the day time, and use the light to their advantage. Nocturnal means active at night time. Thus, the correct options will be A and B.
What is Diurnal and Nocturnal?Based on the activeness of an organism during a day or 24 hours time period, the animals or organisms can be classified into two different types which are nocturnal and diurnal organisms. Nocturnal animals are the animals which are most active during the night time, and diurnal animals are the animals which are active during the daytime.
Diurnal animals are those animals which are awake during the day time, and use the light energy to their advantage. Nocturnal animals are the animals which are active at the night time.
Therefore, the correct options will be A and B.
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fill in the blanks......
the new cells that arise after cell division are called _____
Answer:
the new cells that arise after cell division are called daughter cells.
FILL IN THE BLANKS....
________________ are the smallest cells present in the human body
Answer: The Cerebellum's Granule Cell is the smallest cell in the human body that is between 4 micrometers to 4.5 micrometers long.
Explanation:
Answer:
The Cerebellum's Granule Cell
In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.2. What is the frequency of individuals with Aa genotype? will reward brainly for best answer with explanation...please no more links or i will report
Answer:
0.42
Explanation:
To estimate the frequency of alleles in a population, we can use the
According to this equation:-
p =
q =
p + q = 1.0
(p + q)
2
= 1 so p
2
+ 2pq + q
2
= 1
p
2
2pq = frequency of Aa
q
2
p+q = 1
0.3 + q = 1
q = 1 - 0.3 = 0.7
Aa = 2pq = 2* 0.3 * 0.7 = 0.42.
The table below shows the average distances of four planets from the sun.
Considering Kepler's Laws, which planet has the fastest average orbital speed?
A. Venus
B. Neptune
C. Saturn
D. Jupiter
Answer:
Venus
Explanation:
The closer a planet is to the Sun the faster it moves because the Sun can exert more gravitational force on it. Venus is the second closest planet to the Sun therefore the fastest out of the options.
Its Venus.
It is closer to the sun than the other planets on here.
What do echinoid, snail, and shark tooth fossils have in common?
Answer: All have calcium made structures which restricts their degradation and decomposition.
Explanation:
Echinoids and snails have exoskeleton which is hard and made up of calcium carbonate which is the least degradable material even after death of the organisms and remains as traces and remains in the fossils. Also the shark tooth is made of dentin which is a hard calcified tissue which does not decompose very easily. It is denser and harder then the bones. It is surrounded by the enamel shell. The dentin and enamel prevent the degradation and decomposition of the shark tooth for long hence, it gets available as fossil.
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Why might more frequent prescribed burns be easier to control than less frequent burns?
Answer:
Wildfires that burn into areas where fuels have been reduced by prescribed burning cause less damage and are much easier to control. ... The time interval between fires can be as often as every year although a 3- or 4-year cycle is usually adequate after the initial fuel-reduction burn.
Explanation:
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Please give a good description of genetic mutations. Thanks!
Answer: A mutation is a change in a DNA sequence? Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals called mutagens, or infection by viruses.
Explanation:
The most common genetic mutation is, In fact, the G-T mutation.
The layer of the atmosphere where all wether occurs
Mutations are a source of variation in:
A)asexually reproducing organisms
B)neither option
C)both options
D)sexually reproducing organisms
what is homologous chromosomes?
Answer:
Homologous chromosomes are two pieces of DNA within a diploid organism which carry the same genes, one from each parental source. Basically, it's two pieces of DNA from your mom and dad that form who you are.
Explanation:
Data collected from part of a population is a _______.
Answer:
Census
Explanation:
A census is a study that obtains data from every member of a population. In most studies, a census is not practical, because of the cost and/or time required.
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what food security challenge currently facing your community?
Answer:
I am not sure what you are looking for but some food is limited due to the pandemic and I am having a hard time obtaining certain goods.
Explanation:
What if I ate myself?
Answer: Then you are deid
Explanation: Not big suprise
Answer:
well you cant actually ate yourself because your body won't fit at our mouth also it will hurt
Genetic Diseases are very common.
Answer:
Cystic Fibrosis is a chronic, genetic condition that causes patients to produce thick and sticky mucus, inhibiting their respiratory, digestive, and reproductive systems. Like Thalassemia, the disease is commonly inherited at a 25 percent rate when both parents have the Cystic Fibrosis gene.
Which behavior shows a way that animals defend their territory
Answer: Territorial behaviour, in zoology, the methods by which an animal, or group of animals, protects its territory from incursions by others of its species. Territorial boundaries may be marked by sounds such as bird song, or scents such as pheromones secreted by the skin glands of many mammals.
Explanation:
Answer:
Wolves work together to chase or kill any wolves that are not in
their group
Explanation:
Many animals rely on smells to mark their territories, spraying urine, leaving droppings or, rubbing scent glands around the territories' borders. Approaching animals will be warned off the territory without ever encountering the territory's defender.
mRNA is a complementary copy of a Dna strand. Write in the complementary RNA bases for the DNA template strand below.
Answer:
UUC AUA GCU CCA ACU GGA UAG
Explanation:
A group of ducks in the same area is a ? Environment, Community, population, organism 
Answer:
community
Explanation: