Based on Lyon’s hypothesis, what will be number of Barr bodies found in a human female sufferi

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4.Principles of Inheritance and Variation

normal

Based on Lyon’s hypothesis, what will be the number of Barr bodies found in a human female suffering from Down’s syndrome

$0$

$1$

$2$

$3$

(AIEEE-2004)

Solution

(b) Down’s syndrome is a chromosomal abnormality in humans and is associated with an extra chromosome $21$ (i.e. chromosomal formula is $45 + xx = 47$),

while one of the two $x$-chromosomes becomes genetically inert and heteropycnotic and forms the Barr body.

Hence human female suffering from Down’s syndrome contains $(2x -1 = 1)$ one Barr body.

Standard 12

Biology

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normal

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normal

Based on Lyon’s hypothesis, what will be the number of Barr bodies found in a human female suffering from Down’s syndrome

Solution

Similar Questions

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