This set of Class 12 Biology Chapter 6 Multiple Choice Questions & Answers (MCQs) focuses on “DNA Fingerprinting”.
1. What are the differences in the specific regions of DNA sequence called during DNA finger printing?
a) Non repetitive DNA
b) Repetitive DNA
c) Satellite DNA
d) Histone DNA
View Answer
Explanation: In DNA finger printing, the differences in the specific regions of the DNA sequence are called as Repetitive DNA. In this part, a small structure of the DNA is repeated many times. These repetitive structures can be separated from the bulk genomic DNA. This is done by observing the different peaks achieved by them during the density gradient centrifugation.
2. What are the small peaks achieved by the repetitive DNA during the density gradient centrifugation process of DNA finger printing known as?
a) Non repetitive DNA
b) Trough
c) Satellite DNA
d) Histone DNA
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Explanation: The genomic DNA forms a high peak in the density gradient centrifugation. Whereas, the various small peaks which are formed are collectively called as the satellite DNA.
3. The sequences of satellite DNA do not code for proteins.
a) True
b) False
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Explanation: The small peaks formed by the DNA when kept in the density gradient centrifugation are called as satellite DNA. These DNA sequences do not code for proteins. On the contrary, they form a large portion in the genome of humans.
4. How DNA can be as a useful tool in the forensic applications?
a) Showing the same degree of polymorphism with hair follicles
b) Showing different degrees of polymorphism with saliva
c) By not possessing any hereditable information
d) By the presence of lysozymes in it
View Answer
Explanation: The double helical structure of the DNA present on saliva, hair follicles, bones, blood and sperm serve as a useful took in the forensic studies. This can be done as the DNA from an individual’s tissue shows the same degree of polymorphism. These polymorphic characters are inheritable from parents to their children.
5. How does polymorphism arise?
a) Mutations
b) Recombination
c) Diploidy
d) Haploidy
View Answer
Explanation: Polymorphism arises due to mutations. It can also be known as the discontinuous variation that is seen among the individuals of a species.
Sanfoundry Global Education & Learning Series – Biology – Class 12.
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