Scelta multipla
Which of the following events does not occur during prophase of mitosis?
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11. Cell Division
Phases of Mitosis
Scelta multipla
Which event occurs during Prophase I of meiosis?
A
Chromosomes align at the metaphase plate
B
Homologous chromosomes pair and exchange segments
C
Sister chromatids separate
D
Nuclear envelope reforms
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Understand that meiosis is a type of cell division that reduces the chromosome number by half, resulting in four daughter cells. It consists of two stages: Meiosis I and Meiosis II.
Recognize that Prophase I is a crucial phase in Meiosis I where several key events occur to ensure genetic diversity.
During Prophase I, homologous chromosomes (each consisting of two sister chromatids) pair up in a process called synapsis. This pairing forms structures known as tetrads.
Once paired, homologous chromosomes undergo a process called crossing over, where they exchange genetic material. This exchange of segments between non-sister chromatids leads to genetic recombination.
Note that the other events listed, such as chromosomes aligning at the metaphase plate and sister chromatids separating, occur in later stages of meiosis or mitosis, not during Prophase I.
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