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Multiple Choice
Once the chromosomes have formed a pair during meiosis, what is the next major event that occurs?
A
The nuclear envelope reforms
B
Homologous chromosomes undergo crossing over
C
Sister chromatids separate
D
DNA replication begins
Verified step by step guidance
1
Understand the sequence of events during meiosis, focusing on what happens after homologous chromosomes pair up (synapsis).
Recall that once homologous chromosomes have paired, the next major event is the exchange of genetic material between them, known as crossing over.
Crossing over occurs during prophase I of meiosis and involves the physical exchange of chromosome segments between homologous chromosomes, increasing genetic diversity.
Recognize that the nuclear envelope does not reform immediately after pairing; it typically breaks down to allow chromosome movement.
Note that sister chromatids separate later during anaphase II, and DNA replication occurs before meiosis begins, not after pairing.