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8. Heredity
hard
मानव में बच्चे का लिंग निर्धारण कैसे होता है?
Option A
Option B
Option C
Option D
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.
Standard 10
Science
