Multiple Choice
Crossing over, resulting in an increase in genetic variation, occurs between _____.
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4. Genetic Mapping and Linkage
Crossing Over and Recombinants
Multiple Choice
During which stage of meiosis does crossing over (genetic recombination between homologous chromosomes) primarily occur?
A
Prophase I (specifically during pachytene)
B
Prophase II
C
Metaphase I
D
Anaphase I
Verified step by step guidance1
Recall that meiosis consists of two sequential divisions: meiosis I and meiosis II, each with distinct stages (prophase, metaphase, anaphase, telophase).
Understand that crossing over, or genetic recombination, involves the exchange of genetic material between homologous chromosomes, increasing genetic diversity.
Identify that crossing over occurs during meiosis I, when homologous chromosomes pair up closely in a process called synapsis.
Focus on prophase I of meiosis I, which is subdivided into stages: leptotene, zygotene, pachytene, diplotene, and diakinesis.
Recognize that crossing over specifically happens during the pachytene stage of prophase I, when the synaptonemal complex is fully formed and homologous chromosomes exchange segments.
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