Answer:
Genetics is involved in determination of sex of a child. A male cell has one X-chromosome and one Y-chromosome, so it produces two types of sperms with genotype A + X and A + Y.
Female sex is homogametic. A female cell has both X-chromosomes, so it produces similar type of eggs with genotype 'A + X'.
Sex of the child depends upon what happened during fertilization.
(i) If a sperm carrying X-chromosome fertilizes the egg, the child born will be female.
(ii) If a sperm carrying Y-chromosome fertilizes the egg, the child born will be male.
Thus, the sperm (or the male cell) determines the sex of the child.
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