Number of chromosomes in Klinefelter’s syndrome is

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4.Principles of Inheritance and Variation

normal

The number of chromosomes in Klinefelter’s syndrome is

A

$47\ (44 + XXY)$

B

$47\ (44 + XXX)$

C

$47\ (46 + 1\ chromosome \ 21)$

D

None of these

Solution

(a)Down’s syndrme also known as Mongolian idiocy is a trisomic resulting from non-disjunction of chromosome number $21^{st}$.

Standard 12

Biology

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