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Multiple Choice
Which event occurs during the Prophase I phase of Meiosis I?
A
Separation of sister chromatids
B
Crossing over between homologous chromosomes
C
Formation of the mitotic spindle
D
Chromosomes align at the metaphase plate
Verified step by step guidance
1
Understand that Meiosis I is the first division in meiosis, which reduces the chromosome number by half and is crucial for sexual reproduction.
Recognize that Prophase I is a key stage in Meiosis I where homologous chromosomes pair up in a process called synapsis.
During Prophase I, crossing over occurs, which is the exchange of genetic material between non-sister chromatids of homologous chromosomes. This increases genetic diversity.
Differentiate between the events of mitosis and meiosis. In mitosis, the mitotic spindle forms and chromosomes align at the metaphase plate, but these are not specific to Prophase I of meiosis.
Remember that the separation of sister chromatids occurs during Anaphase II of Meiosis II, not during Prophase I of Meiosis I.