Multiple Choice
When does the secondary oocyte complete meiosis II?
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12. Meiosis
Introduction to Meiosis
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What is the purpose of crossing over during prophase I of meiosis?
A
To align chromosomes at the metaphase plate
B
To ensure the separation of sister chromatids
C
To replicate DNA before cell division
D
To increase genetic diversity by exchanging DNA between homologous chromosomes
Verified step by step guidance1
Understand that meiosis is a type of cell division that reduces the chromosome number by half, creating four haploid cells, each genetically distinct from the parent cell.
Recognize that meiosis consists of two stages: Meiosis I and Meiosis II. Prophase I is a part of Meiosis I.
During prophase I, homologous chromosomes pair up in a process called synapsis, forming structures known as tetrads.
Crossing over occurs during prophase I, where non-sister chromatids of homologous chromosomes exchange segments of genetic material.
The purpose of crossing over is to increase genetic diversity by creating new combinations of alleles, which contributes to variation in offspring.
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