NEET BIOLOGY

Detailed explanation-1: -Because they are produced by mitosis, primary spermatocytes, like spermatogonia, are diploid and have 46 chromosomes. Each primary spermatocytes goes through the first meiotic division, meiosis I, to produce two secondary spermatocytes, each with 23 chromosomes (haploid).

Detailed explanation-2: -Preleptotene primary spermatocytes contain a diploid complement of chromosomes (46 chromosomes or 2N, where N is the number of haploid chromosomes), and they are the last germ cells to undergo DNA synthesis.

Detailed explanation-3: -In males, meiosis I occurs only in primary spermatocytes that are 4N, and this process is characterized by genetic recombination where the paternal homolog of each chromosome breaks and rejoins with its maternal homolog.

Detailed explanation-4: -The formation of primary spermatocytes begins in humans when a male is sexually matured at puberty. Q. Assertion :The type B spermatogonia are called primary spermatocytes. Reason: Primary spermatocytes complete the first meiotic division leading to secondary spermatocytes.