CBSE Class 10 Science sample question paper 2023 – 2024.

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Sex of an infant is determined by the type of sex chromosome contributed by the male gamete not female gamete. A male produces two types of sperms – one type bears 22 + X composition and the other, 22 + Y.

Therefore, a male has 50 % sperms with X – chromosomes and other 50 % with Y – chromosome.

We are humans and we have 23 pairs of chromosomes. But the sex of an infant is particularly, determined by the type of sex chromosome contributed by the male gamete. Any one of the two types (22 + X types, 22 + Y types) of sperms can fertilise the egg.

Let assume – If a Y – bearing sperm fertilises the egg, the zygote will be XY (which is male) and when an X – bearing sperm fertilises the egg, the resulting zygote will be XX (which is female). So, the ratio of X – Chromosome and Y – Chromosome in male gamete is 50 : 50. Hence,

statistical the probability of male child or a female child infant is also 50 : 50.

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The sex of an infant is determined by the type of sex chromosome contributed by the male gamete. A male produces two types of sperms – one type bears 22 + X composition and the other, 22 + Y. Therefore, a male has 50 % sperms with X – chromosomes and other 50 % with Y – chromosome.

As we know, any of the two types of sperms can fertilise the egg. Let assume, if a (Y – bearing sperm) fertilises the egg, the zygote will be XY (male child) and when an (X – bearing sperm) fertilises the egg, the resulting zygote will be XX (female child). Thus, the ratio of X – chromosome and Y – chromosome in male gamete is 50 : 50. The statistical probability of male or a female infant is also 50 : 50.