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Solution


Q.

A disease caused by an autosomal primary non-disjunction is            [2017]
1 Klinefelter’s syndrome  
2 Turner’s syndrome  
3 Sickle cell anaemia  
4 Down’s syndrome  

Ans.

(4)

Down’s syndrome is an autosomal aneuploidy, caused by the presence of an extra-chromosome number 21. Both the chromosomes of the pair 21 pass into a single egg due to non disjunction during oogenesis.