Heritable Variations - Mutation and Generic Recombination


 
 
Concept Explanation
 

Heritable Variations - Mutation and Generic Recombination

Heritable Variation

Heredity involves the transmission of characteristics from parents to their offspring. Among sexually reproducing organisms, the progeny are not exact duplicates of their parents.

Heritable variation is the result of changes in the arrangement of genes on the chromosomes and changes in the sequence of the bases that constitute DNA. Such changes occur spontaneously and randomly in the DNA, which undergoes duplication just before the cell divides.

Duplication is done with great precision, but once in about ten million duplications there is an error as a different base may be put in place of the correct one.

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Sample Questions
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Question : 1

_______________ involves the transmission of characteristics from parents to their offspring. 

Right Option : A
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Question : 2

The spontaneous changes in the  _____________________  are proportional to the number of duplications  and cell divisions.

Right Option : A
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Question : 3

Deoxy ribonucleic acid (DNA) consists of simple sugar phosphate and four nitogrn bases , which one of the following groups of nitrogen bases is present in DNA molecule?

Right Option : C
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