Question

GAMETOGENESIS: Which of the following is TRUE of both male and female gametogenesis in humans?

Group of answer choices

a) Primary spermatocytes and primary oocytes are both diploid (2n) cell types.

b) The divisions of meiosis happen completely within the gonads in both sexes.

c) Meiosis II is completed after fertilization in both gametes

d) Meiosis begins at puberty and continues throughout adulthood

e) The first and second meiotic divisions are both equal (producing two cells of the same size)

Answer 1

Primary spermatocytes and primary oocytes develop from spermatogonium and germinal cell (oogonium) respectively through mitosis. as spermatogonium and germinal cell are diploid so primary spermatocyte and primary oocyte are both diploid cells.

The divisions of meiosis happen completely within the gonad in both sexes as in males it occurs in seminiferous tubules of testes and in females it occurs in outer wall of ovary.

Meiosis 2 in spermatogenesis is completed before fertilization. But in oogenesis it is completed after fertilisation.

Meiosis begins before birth during embryonic development in oogenesis but primary oocyte gets arrested in prophase stage.

first meiotic division in spermatogenesis produce two cells( secondary spermatocytes) and 2 meiosis produce 4 cells( spermatid). In oogenesis both first and second meiosis produce one polar body and oocyte which are unequal in size.

So statement a and b are true for both male and female gametogenesis in humans.