Multiple Choice
Crossing over between homologous chromosomes (genetic recombination) occurs during which phase of meiosis?
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4. Genetic Mapping and Linkage
Crossing Over and Recombinants
Multiple Choice
In which stage(s) of meiosis does crossing-over between homologous chromosomes normally occur?
A
Both prophase I and prophase II
B
Prophase II of meiosis II only
C
Prophase I of meiosis I only
D
Anaphase I and anaphase II
Verified step by step guidance1
Recall that meiosis consists of two sequential divisions: meiosis I and meiosis II, each with its own stages (prophase, metaphase, anaphase, telophase).
Understand that crossing-over is the process where homologous chromosomes exchange genetic material, increasing genetic diversity.
Identify that crossing-over occurs during the pairing of homologous chromosomes, which happens in prophase I of meiosis I when homologs synapse to form tetrads.
Note that prophase II of meiosis II involves individual chromosomes (not homologous pairs), so crossing-over does not occur at this stage.
Recognize that anaphase stages involve separation of chromosomes or chromatids, so crossing-over cannot occur during anaphase I or anaphase II.
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