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Principles of Inheritance and Variation question

2015 · Q55
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Principles of Inheritance and Variation question

2015 · Q55

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
An abnormal human baby with ‘XXX’ sex chromosomes was born due to
  1. A
    formation of abnormal sperms in the father
  2. B
    fusion of two ova and one sperm
  3. C
    formation of abnormal ova in the mother
  4. D
    fusion of two sperms and one ovum
View written solutionFree

Correct answer: C

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

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