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Extra copies of the other chromosomes are probably fatal to the developing embryo that's why individuals with extra chromosome 21 are more numerous than extra chromosomes 3 or 16.

The term "aneuploidy" in genetics refers to the alteration in chromosomal number 23, which can result in hereditary disorders. An individual is said to be aneuploid if they have fewer chromosomes than the wild or euploid type due to an additional or missing chromosome, which is invariably linked to a lack of either physical or mental development or both. This happens during errors in meiosis, the type of cell division that takes place during the development of gametes, which are sex cells that give rise to zygotes during fertilization.

Non-disjunction is a failure of the meiotic process, in which two chromatids or chromosomes pair up and one pole receives nothing. When homologous chromosomes fail to split properly during meiosis I, two defective cells are produced as a result: one has an extra chromosome and the other lacks a chromosome. The chromatids in the chromosomes separate during meiosis II, which may also result in the formation of abnormal cells.

The trisomy on chromosome 21 is more prevalent because the condition is not fatal. Trisomy on a different pair of chromosomes, however, can often be fatal. Having an extra chromosome impacts the way a newborn develops both physically and intellectually. The newborn and future adult may face a variety of mental and physical difficulties as a result of these changes. This is because the DNA in those chromosomes changes how much protein is made and is encoded by them.

The complete question is:

Why are individuals with an extra chromosome 21, which causes Down syndrome, more numerous than individuals with an extra chromosome 3 or chromosome 16?

(A). There are probably more genes on chromosome 21 than on the others.

(B). Chromosome 21 is a sex chromosome, and 3 and 16 are not.

(C). Down syndrome is not more common, just more serious.

(D). Extra copies of the other chromosomes are probably fatal to the developing embryo.

(E). The nondisjunction of chromosomes 3 and 16 probably occurs much less frequently.

To learn more about chromosomal disorders please click on the given link: brainly.com/question/29100880

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5 0

1 year ago

The typical size of a bacterium is A. 1 nm B. 10 nm C. 1000 nm D. 1 km

mestny [16]

Answer: 1000 nm

Explanation:

Bacteria are the type of biological cell. They constitute a large domain as they are found every where on the earth.

These are few micrometer in length which means 200-700nm . It depends on the type of the bacterial cell. The bacteria are the first organism that appeared on earth.

They are found in water, on land, desert, hydro thermal vent, snow et cetera. These are variable in shape.

5 0

4 years ago

On a global scale, energy _____ ecosystems whereas chemical elements _____ ecosystems. see concept 55.1 (page 1237) on a global

Kay [80]

The choices for this question are:
-is biologically magnified in ... are recycled in
-is dissipated in ... flow through
-flows through ... are recycled in
-is continuously supplied to ... are continuously removed from
-is recycled in ... flow through

On a global scale, energy flows through ecosystems whereas chemical elements are recycle in ecosystems. So the answer is the third option.

Energy flows through the ecosystem. Most energy comes from sunlight and it is transformed into chemical energy by autotrophs. When they are consumed by heterotrophs the energy is passed on, until it dissipates as heat.

Chemical elements like carbon and nitrogen, on the other hand, are cycled between biotic and abiotic factors in an ecosystem. This is not possible for energy. These chemical elements come from abiotic factors like the air, light and soil. They are incorporated in the biomass of the photosynthetic organisms and are consumed by other organisms. They are changed back into their inorganic form when the organism dies and are broken down by decomposers and the cycle goes on. So they are constantly being recycled.

In summary, energy needs a continuous source to be able to maintain and sustain the energy flow in the ecosystem. Chemical elements, on the other hand, are just recycled through processes between abiotic factors and biotic factors.

8 0

3 years ago