Sex determination of child is done by the chromosome of

Father
Mother
Both father and mother
None of these

The correct answer is C. Both father and mother.

A human cell contains 23 pairs of chromosomes, for a total of 46 chromosomes. One pair of these chromosomes, the sex chromosomes, determines the sex of the individual. Females have two X chromosomes, while males have one X chromosome and one Y chromosome.

When a sperm fertilizes an egg, the sperm’s chromosome determines the sex of the child. If the sperm carries an X chromosome, the child will be female. If the sperm carries a Y chromosome, the child will be male.

Therefore, the sex of a child is determined by the chromosomes of both the father and the mother.