Question Video: Recalling the Stage in Sperm Production at Which Meiosis Occurs | Nagwa Question Video: Recalling the Stage in Sperm Production at Which Meiosis Occurs | Nagwa

Question Video: Recalling the Stage in Sperm Production at Which Meiosis Occurs Biology

In which phase of sperm production does meiosis occur?

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Video Transcript

In which phase of sperm production does meiosis occur? (A) The multiplication phase, (B) the growth phase, (C) the maturation phase, (D) the endocrine phase, or (E) the metamorphosis phase.

To answer this question, let’s recap the different phases of sperm production. The first phase is called the multiplication phase. The multiplication phase involves diploid primary germ cells dividing many times by mitosis and being converted into diploid spermatogonia. Remember, most body cells are diploid, which means that they contain two full sets of chromosomes, often represented as two n. In humans, the diploid number is 46 chromosomes in each cell in total. However, in this diagram, we will represent this as just four chromosomes.

The second phase is called the growth phase. During the growth phase, spermatogonia divide by mitosis and differentiate into primary spermatocytes, which are also diploid. The primary spermatocytes also replicate their genetic material at this point so that they are ready for meiosis.

The third phase of spermatogenesis is the maturation phase. This phase consists of two cellular divisions called meiosis I and meiosis II. During meiosis I, the genetic material in each primary spermatocyte is divided equally to form two cells called secondary spermatocytes. The secondary spermatocytes are haploid cells, which is often represented as n. Haploid cells contain only 23 chromosomes in humans, which is half the number of chromosomes of most other body cells, including the primary spermatocytes that formed them. During meiosis II, the secondary spermatocytes divide again to form haploid spermatids.

The final stage of sperm production is the metamorphosis phase, during which the round spermatids develop specializations, like tails, to become mature sperm cells.

Now we have enough information to answer the question, which asks us to determine the stage of sperm production during which meiosis occurs. Meiosis occurs during (C) the maturation phase.

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