Multiple Choice
In eukaryotic meiosis, during which stage does crossing over between homologous chromosomes occur, generating recombinant chromatids?
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4. Genetic Mapping and Linkage
Crossing Over and Recombinants
Multiple Choice
Crossing over between homologous chromosomes most commonly occurs during which phase of meiosis?
A
Prophase II
B
Metaphase I
C
Anaphase I
D
Prophase I (specifically pachytene)
Verified step by step guidance1
Recall the stages of meiosis, which include Prophase I, Metaphase I, Anaphase I, and Prophase II, among others.
Understand that crossing over is the process where homologous chromosomes exchange genetic material, increasing genetic diversity.
Identify that crossing over occurs during Prophase I, specifically in the pachytene stage, when homologous chromosomes are tightly paired and synapsed.
Note that during Metaphase I, homologous chromosomes align at the metaphase plate, but crossing over has already occurred by this point.
Recognize that Anaphase I involves the separation of homologous chromosomes, and Prophase II occurs later in meiosis II, so crossing over does not happen in these phases.
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