How is the sex of the child determined in human beings?

Q. How is the sex of the child determined in human beings? 



In human body, there are 23 pairs of chromosomes in the cell. Out of these, 22 pairs have a maternal and a paternal copy of genes, but do not take part in sex-determination in human being. The 23rd pair, which is not always a perfect pair, is called sex chromosomes. Women have a perfect pair of sex chromosomes XX. But men have a mismatched pair of chromosomes in the form XY. This cell is divided meiotically in both men and women to form gametes. All children will inherit an X chromosome from their mother regardless of whether they are boys or girls and an X or Y chromosomes from their father. Thus, the sex of the children will be determined by what they inherit from their father. A child who inherits an X chromosome from her father will be a girl, and one who inherits a Y chromosome from him will be a boy.

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