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Question

Assertion :SNPs are more stable Reason: They have very low mutation rates

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is D Assertion is incorrect but Reason is correct

Single nucleotide polymorphisms, frequently called SNPs (pronounced “snips”), are the most common type of genetic variation among people. Each SNP represents a difference in a single DNA building block, called a nucleotide. For example, an SNP may replace the nucleotide cytosine (C) with the nucleotide thymine (T) in a certain stretch of DNA. SNP is a kind of a mutation. Mutations are any changes made in the sequence of DNA. Mutations don't always have a strong negative effect, and such mutations (or changes) in DNA sequence can remain in the population. SNP is this sort of a mutation.SNP is a change (mutation) in a single nucleotide in the sequence. If you align the DNA sequence of individuals from a population, you observe that most of the sequence is identical, but there are some locations (on the sequence) where the nucleotides are different for different individuals. This is a single nucleotide polymorphism. Thus, an SNP is when there are more than one nucleotides at a given location when you look at DNA sequences of a population. SNP may generate different versions of a gene in a population.

So, the correct answer is "D".


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