Multiple Choice
During anaphase I of meiosis, __________.
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9. Mitosis and Meiosis
Meiosis
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Which of the following statements about crossing over during meiosis I is correct?
A
Crossing over prevents homologous chromosomes from separating during meiosis I.
B
Crossing over increases genetic diversity by exchanging genetic material between homologous chromosomes.
C
Crossing over occurs between sister chromatids of the same chromosome.
D
Crossing over only occurs during meiosis II.
Verified step by step guidance1
Understand the process of crossing over: Crossing over occurs during prophase I of meiosis I, where homologous chromosomes pair up and exchange segments of genetic material.
Recall that crossing over happens between non-sister chromatids of homologous chromosomes, not between sister chromatids of the same chromosome.
Recognize that crossing over increases genetic diversity by creating new combinations of alleles on each chromosome, which is important for variation in offspring.
Note that crossing over does not prevent homologous chromosomes from separating; instead, it facilitates proper alignment and separation during meiosis I.
Remember that crossing over does not occur during meiosis II, as sister chromatids separate during this stage without further genetic exchange.
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