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  • In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.

In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.

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  • Humans have two sex chromosomes, X and Y.
  • In females, two X chromosomes are present, making it a perfect pair.
  • But in males, one is a normal-sized X-chromosome while other is a short Y-chromosome.
  • In humans, sex of the child is determined by chromosome inherited by the father.
  • If the zygote inherits X chromosome, the zygote will develop into a female.
  • If the zygote inherits Y chromosome, the zygote will develop into a male.

So, 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.

So the zygote receives X chromosome from the female but from male zygote can receive either X or Y chromosome which is 50 – 50 probability wise.

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