Nondisjunction involving the X chromosomes may occur during oogenesis and produce two kinds of eggs. If normal sperm fertilize these two types, which of the following pairs of genotypes are possible?

Question

Quizplus · Accepted Answer

Nondisjunction during oogenesis can result in eggs with either two X chromosomes (XX) or no X chromosome (O). When fertilized by normal sperm (which can be X or Y), the possible genotypes are XXY (from XX egg and Y sperm) and XO (from O egg and X sperm).

Nondisjunction Involving the X Chromosomes May Occur During Oogenesis and Produce