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Snezhnost [94]
3 years ago
11

Why is having an extra chromosome 21 tolerable to the point that someone with this condition can survive to maturity?

Biology
1 answer:
Vilka [71]3 years ago
6 0
I think that having an extra chromosome 21 is tolerable to the point that someone with this condition can survive to maturity because it does not replicate.

There should only be a pair of chromosome 21. In the event that there are 3 chromosome 21, the person that has this extra chromosome has Down syndrome. Changes in the number and structure of this chromosome may result to delayed development, intellectual disability, but not immediate death.
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Answer: The probability is 100%.

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In the question, the woman is color-blind, which means she carries the recessive alleles: X^{d}X^{d}

The man, on the other hand, is normal, so his X-linked genotype will be: X^{D}Y.

Now, since they have a daughter, she inherited her double X from each of her parents, which means she inherited one X^{d} from her mother and one X^{D} from her father.

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5 0
3 years ago
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DochEvi [55]
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Answer:

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Explanation:

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7 0
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