During which specific stage of meiosis does crossing over occur?
A
Prophase I
B
Metaphase II
C
Anaphase I
D
Telophase II
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1
Recall that meiosis consists of two main divisions: meiosis I and meiosis II, each with several 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 closely, forming structures called tetrads or bivalents.
Recognize that this pairing and exchange happen specifically during prophase I of meiosis, when homologous chromosomes undergo synapsis.
Conclude that crossing over does not occur during metaphase II, anaphase I, or telophase II, as these stages involve chromosome alignment, separation, or cell division without genetic exchange.