Question

Crossing over occurs during prophase I, not prophase II. Crossing over is advantageous because it allows for the exchange of genetic material between homologous chromosomes, which can lead to new and beneficial combinations of genes. This can increase the genetic diversity of a population, which can make the population more resistant to disease and other environmental challenges.

Which of the following is NOT a stage of meiosis during which crossing over occurs?
(a) Prophase I
(b) Metaphase I
(c) Anaphase I
(d) Prophase II

Answer 1

Crossing-over occurs during prophase I of meiosis I and allows for the exchange of genetic material between homologous chromosomes, resulting in increased genetic diversity.

Step-by-step explanation:

Crossing-over occurs during prophase I of meiosis I, not prophase II. It is the exchange of genetic material between non-sister chromatids of homologous chromosomes. This process creates new combinations of genes on each chromosome, resulting in increased genetic diversity.