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

Monjur Alahi

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Salim Ahmed Kawsar

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The sex of an infant is determined by the type of sex chromosome contributed by the male gamete. Since the ratio of male gametes containing X chromosome and those containing Y chromosome is 50 : 50, the statistical probability of male or a female infant is also 50 : 50.

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Salim Ahmed Kawsar

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  • Sex of the offspring is determined by the gamete donated by male. 
  • Male possess X and Y chromosomes in their 23rd pair.
  • The ration between X and Y is 1. 
  • Hence the probability of getting either a male or female child is 50: 50.

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