JIPMER2019ZoologyPrinciples of Inheritance and Variation

Karyotype of Down's syndrome has how many chromosomes?

Options

Correct answer

C. 47

Step-by-step solution

Karyotype of people suffering from Down's syndrome has 47 chromosomes ( 45+ XY in males, 45+ XX in females) instead of 46 . It is caused due to the presence of an extra chromosome number 21 , thus it is also known as 21 trisomy.

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