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  • An abnormal human baby with 'XXX' sex chromosomes was born due to:Option: 1 fusion of two ova and one sperm

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

Option: 1

fusion of two ova and one sperm


Option: 2

fusion of two sperms and one ovum


Option: 3

formation of abnormal sperms in the father


Option: 4

formation of abnormal ova in the mother


Answers (1)

best_answer

Formation of an abnormal ova usually occurs as an event during the formation of reproductive cells. An error in cell division callednon-disjunction can result in reproductive cells with additional chromosomes. Any of these cells if contributes in the genetic make up of child leads to trisomy of X-chromosome i.e. the child will have an extra X-chromosome. ZZ+ XX in mother will lead to birth of XXX genotype baby.

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