Crossing-over of chromatid segments during meiosis division 1 results in:
A) Spontaneous gene mutations
B) Initial DNA synthesis
C) Bivalent X and Y genes
D) New gene combinations
Ans: D
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Crossing-over of chromatid segments allows for new gene combinations and increased genetic variability. It is unrelated to mutations. DNA synthesis occurs only during or after meiosis division 2. Because X and Y chromosomes are not homologs, they do not pair up to form bivalents during meiosis division 1.
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