Q.

Mark the incorrect statement about repetitive DNA.

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a

They are stretches of DNA sequences that are repeated many times.

b

The degree of polymorphism in different cells of the same individual varies.

c

They are thought to have no direct coding functions

d

They shed light on chromosome structure, dynamics and evolution.

answer is C.

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Detailed Solution

Repetitive DNA show high degree of polymorphism and form the basis of DNA fingerprinting. Since DNA obtained from every tissue (such as blood, hair-follicle, skin, bone, saliva, sperm etc.), from an individual show the same degree of polymorphism, they become very useful identification tool in forensic applications.

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