GENERAL HISTOLOGY

Detailed explanation-1: -Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis.

Detailed explanation-2: -Spermatogonia are diploid cells, each with 46 chromosomes (23 pairs) located around the periphery of the seminiferous tubules. At puberty, hormones stimulate these cells to begin dividing by mitosis. Some of the daughter cells produced by mitosis remain at the periphery as spermatogonia.

Detailed explanation-3: -Spermatogonia, the primordial male germ cells that are the precursors of spermatozoa multiply by mitosis throughout adult life. Spermatogonia initiate myosis by duplicating their DNA to yield 46 chromosomes each with 2 daughter chromatids. At this stage the germ cells are called primary spermatocytes.

Detailed explanation-4: -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-5: -Thus, the body cells have both the sets of chromosomes i.e. they are diploid. But the sex cells, egg and sperm, are haploid ie. only one set of chromosomes is present in them. So, egg and sperm of humans will have only 23 chromosomes.