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In which of the following conditions does a human zygote develop into a viable male baby?

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When a sperm carrying X chromosome fertilises ovum

When a sperm carrying Y chromosome fertilises ovum

When an ovum carrying no sex chromosome gets fertilised

When the zygote lacks X chromosomes

answer is B.

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Detailed Solution

A normal male has AAXY. Zygote is formed when a sperm carrying Y chromosome fuses with ovum carrying X chromosome. Without at least one X chromosome, the zygote would not be viable.

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