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

4 2015 AIPMT-I Principles of Inheritance and VariationChromosomal disorders Medium
An abnormal human baby with 'XXX' sex chromosomes was born due to
A Formation of abnormal sperms in the father
B Formation of abnormal ova in the mother
C Fusion of two ova and one sperm
D Fusion of two sperms and one ovum

Detailed Solution

An abnormal ovum carrying an extra X chromosome (22 + XX), fertilised by a normal X-bearing sperm, gives a 44 + XXX baby.
So the cause is formation of abnormal ova in the mother.

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