APFIVE Evidence of Nondisjunction in Meiosis I
Which of the following observations from a chromosomal analysis of an organism’s gametes would indicate that nondisjunction occurred during meiosis I?
A
Chromosomes in gametes contain a single chromatid
B
Some gametes contain both maternal and paternal copies of a chromosome
C
All gametes contain exactly half the species’ chromosome number
D
Gametes show evidence of crossing over between homologs
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