An abnormal human baby with 'XXX' allosome genotype was born due to

Fusion of 2 ova and 1 sperm

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Fusion of 2 sperms and 1 ova

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Formation of abnormal sperms in father

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Formation of abnormal ova in mother

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Solution

The correct option is D Formation of abnormal ova in mother
Baby has extra X chromosome, thus it must have been produced by fusion of XX ovum with normal X sperm.
In males abnormal sperms possible are XY and O.
If fusion of multiple gametes had occured, then baby would have had triploid genotype not trisomy.

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