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All India-2019 BVM-2
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Q16 of 43 Page 1

(a) How does mutation occur?

(b) Differentiate between point mutation and frameshift mutation.


a) Mutation is said to occur when there is any kind of change in DNA. Mutation may occur due to insertion or deletion of a single nucleotide, there might be translocation of nucleotides i.e. change in position of DNA segments.


b) There can be two types of mutations:



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14

Construct a flow chart exhibiting sequential events of oogenesis.

15

Draw L.S. of an embryo of grass and label its parts.

OR


Draw a diagrammatic sectional view of a seminiferous tubule (enlarged) in humans and label its parts.


17

‘‘Use of heavy isotope of nitrogen by Meselson and Stahl demonstrated semi-conservative mode of replication of a DNA molecule.’’ Explain how did they arrive at this conclusion.

OR


Explain the mechanism of translation that occurs in the ribosomes in a prokaryote.


18

According to Darwinian theory of natural selection the rate of appearance of new forms is linked to the life-cycle or the life-span of an organism. Explain with the help of an example.

Questions · 43
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