9. Mitosis and Meiosis

Meiosis

9. Mitosis and Meiosis

Meiosis

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Multiple Choice

Which of the following are sources of genetic variation during meiosis?

Crossing over, independent assortment

Crossing over, DNA replication

DNA replication, independent assortment

Disjunction, crossing over

Verified step by step guidance

Understand that genetic variation is crucial for evolution and adaptation, and meiosis is a key process that increases genetic diversity.

Recognize that 'crossing over' occurs during prophase I of meiosis, where homologous chromosomes exchange genetic material, leading to new combinations of alleles.

Identify 'independent assortment' as the process during metaphase I where homologous chromosome pairs are distributed randomly into daughter cells, contributing to genetic variation.

Clarify that 'DNA replication' occurs before meiosis begins, during the S phase of the cell cycle, and does not directly contribute to genetic variation during meiosis itself.

Note that 'disjunction' refers to the separation of homologous chromosomes or sister chromatids during anaphase I or II, respectively, and while it is crucial for proper chromosome segregation, it does not introduce new genetic variation.

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