I can determine which sex chromosome was donated by the male parent, and which sex chromosome was donated by the female parent." Frieda's claim is accurate under which of these conditions?

Question

Biology

Drew

2 June, 22:49

I can determine which sex chromosome was donated by the male parent, and which sex chromosome was donated by the female parent." Frieda's claim is accurate under which of these conditions?

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Answers (1)

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Hermione · Answer 1

Freida's claim is accurate only under certain conditions.

Explanation:

Freida claims that she can determine which sex chromosome was donated by the male parent and which was donated by the female parent. This claim cannot always be valid. A female parent has homozygous sex chromosomes. Both the sex chromosomes of a female is X.

A male has one X chromosome and one Y chromosome. In reproduction a female parent always donates an X chromosome. A male parent may donate either an X or a Y chromosome. This determines the sex if the child.

If an X chromosome is donated the child will be girl with the genotype XX and if the Y chromosome is donated the child will be boy with genotype XY. Thus only in the case the child is a boy can we correctly determine which sex chromosome was denoted by the male parent and female parent.

If the child is a girl with both X chromosomes we cannot determine which X chromosome was donated by father and which was donated by mother because both are X.