Question

“Gender of child is determined by the male partner of couple”. Draw a diagram explaining the above statement.

Answer 1

1). The chromosome number in germ cells producing the gametes are diploid i.e. 2n. It includes 22 pairs of autosomes and 1 pair of sex-chromosomes i.e. (44 + XX or 44 + XY).
2). These germ cells divide by meiosis.
3). Due to this, gametes contain only haploid (n) number of chromosomes i.e. (22 + X or 22 + Y).
4). Two types of sperms are produces as (22 + X) or (22 + Y) whereas oocytes are produced of only one type as (22 + X).

5). Both, sperms and oocytes are produced by meiosis.
6). In case of sperms, process of meiotic division is completed before the sperms leave male reproductive tract.
7). However, in case of oocytes, process of meiotic division completes after ovulation; during fertilization in oviduct.