An abnormal human baby with 'XXX' sex chromosomes was born due to

Fusion of two ova and one sperm

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Fusion of two sperms and one ovum

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Formation of abnormal sperms in the father

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Formation of abnormal ova in the mother

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Solution

The correct option is D Formation of abnormal ova in the mother
Triple X syndrome occurs in women, who inherit three X chromosomes--their genotype is XXX. This type of syndrome is very rare and occurs due to defects in meiosis 1 and 2 during gamete formation in the mother and produces abnormal ova. Therefore, the correct answer is option D.

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