Mohan’s mother has delivered a baby girl. He wants to know from his teacher how eggs get converted into a baby boy or a baby girl. The teacher tells him that there are two types of sex chromosomes X and Y. The fusion of these sex chromosomes through gametes leads to the birth of a baby boy or a baby girl. Baby girl is born when a sperm containing

Y chromosomes fuses with an egg containing X chromosome

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X chromosome fuses with an egg containing X chromosome

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Y chromosome fuses with an egg containing Y chromosome

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X chromosome fuses with an egg containing Y chromosome

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Solution

The correct option is B
X chromosome fuses with an egg containing X chromosome

A baby girl is born when a sperm containing X chromosomes fuses with an egg containing X chromosome. A baby boy is born when a sperm containing Y chromosomes fuses with an egg containing X chromosome.

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