Question

diploid cells become haploid during_________.

Explanation:

• Mitosis results in diploid daughter cells. So options with mitosis (mitosis, meiosis I and mitosis, meiosis II and mitosis) are incorrect.
• Meiosis I is the reduction - division. In meiosis I, homologous chromosomes separate. A diploid cell (with two sets of chromosomes) enters meiosis I. After meiosis I, the daughter cells have one set of chromosomes each (haploid).
• Meiosis II is similar to mitosis. It starts with haploid cells (produced after meiosis I) and results in haploid cells (no change in ploidy level during meiosis II).

Answer:

meiosis I