Question

how is the sex of the child determined in human beings

Answer 1

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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Answer 2

the sex of child is determined in human beings by the chromosomes like female have 2 x chromosome xx and male have only chromosome xy .So,in this way it is determined.