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What is the probability of a girl or a boy being born in a family? Justify your answer.
Answer:
There are two types of chromosomes present in a human, 22 autosomes and a pair sex chromosomes. Females have XX sex chromosome whereas males have an XY chromosome.
An infant receives one chromosome from both the parents. The sex of the infant is decided by the chromosome carried by the father (male gamete). This is because the infant will always receive an X chromosome from the mother (female gamete). If the male gamete carries X chromosome, it will be a daughter and if it carries a Y chromosome, it will be a son.
Therefore, there is 50% chance of an infant being a girl and 50% chance of it being a boy.
