NEET Sample Paper NEET Sample Test Paper-19

  • question_answer 174) Satellite DNA is important because it

    A)  Shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children.

    B)  Does not code for proteins and is same in all members of the population.

    C)  Codes for enzymes needed for DNA

    D)  Codes for proteins needed in cell

    Correct Answer: A

    Solution :

    DNA fingerprinting involves identifying the differences in some specific regions in DNA sequence called as repetitive DNA, because in these sequences, a small stretch of DNA is repeated many times. These repetitive DNA are separated from bulk genomic DNA as different peaks during density gradient centrifugation. The bulk DNA forms a major peak and the other small peaks are referred to as satellite DNA. Depending on base composition (A : T rich or G : C rich), length of the segment and number of repetitive units, the satellite DNA is classified into many categories, such as micro-satellites, mini-satellites, etc. These sequences normally do not code for any proteins, but they form a large portion of human genome. These sequence show high degree of polymorphism and form the basis of DNA fingerprinting. Hence, the correct option is [a].

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