AP BIOLOGY

CELL DIVISION

MEIOSIS AND GENETIC VARIATION

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

Crossing over occurs in which meiotic phase?

A	cytokinesis II
B	anaphase I
C	metaphase II
D	prophase I

Explanation:

Detailed explanation-1: -Crossing over occurs during the pachytene stage of prophase in meiosis, however the chiasma are visible during. No worries!

Detailed explanation-2: -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-3: -Meiosis I includes crossing over or recombination of genetic material between chromosome pairs, while meiosis II does not. This occurs in meiosis I in a long and complicated prophase I, split into five sub-phases.

There is 1 question to complete.