EVERYDAY SCIENCE

Detailed explanation-1: -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-2: -Primary spermatocytes are diploid cells which consist of 46 chromosomes in each cell. Each secondary spermatocyte contains 23 chromosomes because they are haploid cells. Thus the correct answer is option A, 46.

Detailed explanation-3: -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-4: -Secondary oocyte, ova, secondary spermatocyte and spermatids are haploid in number, each with 23 chromosomes.

Detailed explanation-5: -Secondary spermatocytes are haploid (N) cells that contain half the number of chromosomes. In all animals, males produce spermatocytes, even hermaphrodites such as C. elegans, which exist as a male or hermaphrodite.