A color-blind, chromatin-positive male child (one Barr body) has a maternal grandfather who was color blind. The boy's mother and father are phenotypically normal. What needed to occur to have this genetic outcome?
A) The mother is homozygous recessive and underwent nondisjunction in meiosis I or II.
B) The mother must be heterozygous and underwent nondisjunction at meiosis II.
C) The chromosomal doubling effect of meiosis II occurred in the father.
D) Nondisjunction in meiosis I of the father occurred.
E) The mother must be heterozygous and underwent nondisjunction at meiosis I.
Answer: B
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