Question

meiosis: during which stage of meiosis does crossing - over occur
during which stage of meiosis does crossing - over occur?
multiple choice
prophase ii of meiosis ii
prophase i of meiosis i
anaphase i of meiosis ii
anaphase ii of meiosis i
metaphase i of meiosis i

Explanation:

Crossing - over occurs during Prophase I of meiosis I. In this stage, homologous chromosomes pair up (synapsis) and exchange genetic material (crossing - over). This genetic recombination is important for genetic diversity. Prophase II of meiosis II involves the condensation of chromosomes but no crossing - over as there are no homologous pairs to exchange material. Anaphase I of meiosis II and Anaphase II of meiosis I are stages of chromosome separation. Metaphase I of meiosis I is when homologous chromosomes align at the equatorial plate, but no crossing - over occurs here.

Answer:

Prophase I of meiosis I