How many primary spermatocytes are required to form 400 spermatozoa in a human male, and what is the number of chromosomes present in a single primary spermatocyte?

Step-by-step solution

During spermatogenesis, each primary spermatocyte undergoes the first meiotic division (meiosis I) to form two secondary spermatocytes, which then undergo the second meiotic division (meiosis II) to form four spermatids. These four spermatids differentiate into four spermatozoa. Therefore, the number of primary spermatocytes required to produce 400 spermatozoa is 400 4 = 100 . Primary spermatocytes are diploid cells. In humans, the diploid chromosome number is 46. Thus, a single primary spermatocyte contains 46 chr