NEET 2015 Biology question

Biology Principles of Inheritance and Variation NEET 2015

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

(1)formation of abnormal ova in the motherCorrect
(2)fusion of two ova and one sperm
(3)fusion of two sperms and one ovum
(4)formation of abnormal sperms in the father

Answer: (1)

Solution

A baby with XXX (triple-X, metafemale) arises through nondisjunction of the X chromosomes during oogenesis, giving an abnormal ovum with XX that is fertilised by a normal X-bearing sperm. The abnormal gamete is therefore

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Question ID VK-091788