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How is the Sex of the Child Determined in Human Beings? - CBSE Class 10 - Science

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Question

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

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.

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APPEARS IN

 NCERT Solution for Science Textbook for Class 10 (2019 to Current)
Chapter 9: Heredity and Evolution
Q: 4 | Page no. 147
Solution How is the Sex of the Child Determined in Human Beings? Concept: Sex Determination - Sex Determination in Humans.
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