Question

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 ?

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.