A Man Has a Condition Where All of His Gametes

Multiple Choice

A man has a condition where all of his gametes undergo nondisjunction of the sex chromosomes in meiosis I, but meiosis II proceeds normally. He mates with a woman who produces all normal gametes. What is the probability that the fertilized egg will develop into a child with Klinefelter syndrome (XXY) ? Assume that all gametes and zygotes are viable.

A) 1/8
B) 1/4
C) 1/3
D) 1/2
E) 0