Human baby will be a male if its 23rd chromosome pair is ____.

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XXX

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Solution

The correct option is B XY
Humans contain 22 pairs of autosomes and 1 pair of sex chromosomes. The female gamete or the egg consists of an “X” chromosome. If this is fertilised by a sperm containing “X” chromosome, the baby will have “XX” chromosome and will be a female. But if the egg is fertilised by a sperm containing “Y” chromosome, the baby will have “XY” chromosome and will be a male.

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The human male gamete with X chromosome fuses with a female gamete to form a zygote. The offspring will be a male child.

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