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How is the Sex of the Child Determined in Human Beings? - Science

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

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Solution

In human beings, the females have two X chromosomes and the males have one X and one Y chromosome. Therefore, the females are XX and the males are XY.
The gametes, as we know, receive half of the chromosomes. The male gametes have 22 autosomes and either X or Y sex chromosome.
Type of male gametes: 22+X OR 22+ Y.
However, since the females have XX sex chromosomes, their gametes can only have X sex chromosome.

Type of female gamete: 22+X

Thus, the mother provides only X chromosomes. The sex of the baby is determined by the type of male gamete (X or Y) that fuses with the X chromosome of the female.

Concept: Sex Determination
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APPEARS IN

NCERT Class 10 Science
Chapter 9 Heredity and Evolution
Q 4 | Page 147
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