Solved 2024 Sample Question Paper CBSE Class 10 Science — Question 5
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What is the probability of a girl or a boy being born in a family? Justify your answer.
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows:
Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called 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 of sex chromosomes in which one is normal sized X chromosome while the other is a short one called Y chromosome. A child receives one chromosome from mother which is essentially X chromosome. 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.