AP BIOLOGY

LABORATORY REVIEW

MITOSIS AND MEIOSIS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

When does the process of crossing over take place?

A	prophase I
B	metaphase I
C	anaphase I
D	telophase I
E	prophase II

Explanation:

Detailed explanation-1: -Crossing over is an enzyme-mediated process, where the exchange of genetic material between non-sister chromatids of homologous chromosomes takes place. It occurs at the pachytene stage of prophase I of meiosis.

Detailed explanation-2: -Crossing over is the exchange of genetic materials between non-sister chromatids of homologous chromosome. It takes place at pachytene stage of prophase-I.

Detailed explanation-3: -Meiotic Arrest at the Diplotene Stage of Prophase I Pachytene is the stage where homologous recombination, including chromosomal crossover, takes place.

Detailed explanation-4: -When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur. Crossing-over is the exchange of genetic material between homologous chromosomes. It results in new combinations of genes on each chromosome.

Detailed explanation-5: -So, the correct answer is Pachytene.

There is 1 question to complete.