An abnormal human baby with XXX sex chromosom | vedclass

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(D) : The abnormal baby has an extra $X$ chromosome,thus it must have been produced by the fusion of an abnormal $XX$ ovum with a normal $X$ sperm.Abn

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formation of abnormal ova in the mother.

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(D) : The abnormal baby has an extra $X$ chromosome,thus it must have been produced by the fusion of an abnormal $XX$ ovum with a normal $X$ sperm.Abnormal $XX$ sperm is not possible because males have an $XY$ genotype; if they produce abnormal sperms,then $XY$ sperms and $O$ sperms would be produced.If the fusion of multiple gametes had occurred (either two ova with one sperm or two sperms with one ovum),the human baby would have a triploid genotype,not the trisomy of sex chromosomes.

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

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