Since and only differ by one nucleotide, they make up a proper pair of sequences, option "4" is the best choice.
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It can be correctly explained with the help of which is a technique used to determine the time when the two species diverged from a .
It uses the mutation rate to determine the same. rate is the rate at which a number of mutations take place in a given unit time.
For example, the rate of the given as one per 60 million years, that is, a mutation in one nucleotide takes place in 60 million years.
Thus, if the two species diverged around 60 million years ago from their common ancestor, then the nucleotide sequence of the two species must differ only in one nucleotide.
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