Question

At what point does crossing over of non sister chromatids occur? A. During prophase of meiosis B. During prophase of mitosis C. During anaphase II of meiosis D. None of the above

Answer 1

Crossing over of non-sister chromatids occurs during prophase I of meiosis, leading to genetic recombination. It does not occur during any phase of mitosis nor in anaphase II of meiosis.

Step-by-step explanation:

The crossing over of non-sister chromatids occurs during prophase I of meiosis. In this phase, chromosomes condense and align with each other, facilitating the exchange of genetic material between non-sister chromatids of homologous chromosomes. This process is important as it leads to genetic recombination, thereby increasing genetic variation in the offspring.

This chromosomal crossover does not occur during any phase of mitosis, nor during anaphase II of meiosis. Instead, in these stages, sister chromatids and bivalent chromosomes are separated to different poles of the cell, leading to the formation of either two daughter cells (in mitosis) or four haploid cells (in meiosis).

Learn more about Crossing Over in Meiosis