Question

which of the following occurs during prophase i of meiosis, but not prophase of mitosis? pairing of like or homologous chromosomes crossing over

Explanation:

• Pairing of homologous chromosomes: In prophase I of meiosis, homologous chromosomes pair up (synapsis). In mitotic prophase, there is no such pairing of homologous chromosomes. Each chromosome (consisting of two sister chromatids) condenses independently.
• Crossing - over: It is a phenomenon that occurs during prophase I of meiosis. Homologous chromosomes exchange genetic material at chiasmata. In mitotic prophase, there is no crossing - over. Mitosis is mainly for growth, repair, and asexual reproduction, and it aims to produce genetically identical daughter cells.

Answer:

Both "pairing of like or homologous chromosomes" and "crossing over" occur during Prophase I of meiosis but not during prophase of mitosis.