Question: When does crossing over usually occur, and what is the end result? a. It occurs during prophase of meiosis I, and the end result is

When does crossing over usually occur, and what is the end result?

a. It occurs during prophase of meiosis I, and the end result is the exchange of pieces between homologous chromosomes.

b. It occurs during prometaphase of meiosis I, and the end result is the exchange of pieces between homologous chromosomes.

c. It occurs during prophase of meiosis I, and the end result is the separation of sister chromatids.

d. It occurs during prometaphase of meiosis I, and the end result is the separation of sister chromatids.

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