What is the first step in meiosis?

The first step in meiosis is DNA replication, which occurs during the S phase of interphase before meiosis officially begins. This step is crucial because it ensures that each chromosome is duplicated, resulting in two sister chromatids for each chromosome. This duplication is essential for maintaining genetic continuity and providing the necessary genetic material for the resulting gametes.

Following DNA replication, meiosis proceeds with two successive divisions: meiosis I and meiosis II. The reduction of chromosome number occurs during meiosis I, where homologous chromosomes are separated. However, the initial process that enables meiosis to take place is the replication of DNA. Hence, recognizing DNA replication as the foundational step is critical for understanding the mechanics of meiosis and its role in sexual reproduction.