Q.

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

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a

fusion of two ova and one sperm

b

fusion of two sperms and one ovum

c

formation of abnormal sperms in the father

d

formation of abnormal ova in the mother.

answer is D.

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Detailed Solution

An abnormal human baby with 'XXX' sex chromosomes was born due to formation of abnormal ova in the mother. This type of syndrome is very rare and occurs due to defects in meiosis I and II during oogenesis in the mother which leads to production of abnormal ova (XX). The fusion of XX ovum with X sperm results in ‘XXX’ offspring.
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An abnormal human baby with 'XXX' sex chromosomes was born due to