Multiple Choice
How can crossing over during meiosis affect the distribution of the four alleles a, a, b, and b on homologous chromosomes?
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4. Genetic Mapping and Linkage
Crossing Over and Recombinants
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During which stage of meiosis does crossing over primarily occur?
A
Prophase II
B
Prophase I
C
Anaphase II
D
Metaphase I
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 when homologous chromosomes pair up and form structures called tetrads or bivalents.
Recognize that the pairing of homologous chromosomes and formation of tetrads happens during Prophase I of meiosis I.
Conclude that crossing over primarily occurs during Prophase I, before the chromosomes are separated in later stages.
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