Answer:
In
human beings, the sex of the individual is genetically determined, i.e., the
genes inherited from parents decide whether it will be boys or girl.
Most human chromosomes have a maternal and a paternal copy, and we have
22 such pairs. But one pair, called the sex chromosomes, is odd in not
always being a perfect pair.
Women have a perfect pair of sex chromosomes, both called
X. But men have a mismatched pair in which one is a normal-sized X while the
other is a short one called Y. So women are XX, while men are XY.
All children will inherit an x-chromosome from their
mother regardless of whether they are boys or girls. 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.
Sex
determination in human beings
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