The both decrease genetic variation
There are four naturally occurring nitrogenous bases, there are four different types of DNA nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C). This sequence is broken into a series of three-nucleotide units known as codons. Each DNA sequence that contains instructions to make a protein is known as a gene.
Sequencing DNA means determining the order of the four chemical building blocks - called "bases" - that make up the DNA molecule. The sequence tells scientists the kind of genetic information that is carried in a particular DNA segment.
DNA sequencing was built upon earlier knowledge of DNA polymerases and cell-free systems for replicating DNA. The chain-termination method, which makes clever use of a "defective" DNA nucleotide, now dominates DNA sequencing technology.
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The simplified drawing shows how changes in polar vortex winds high in the stratosphere can influence the North Atlantic to cause changes in the global "conveyor belt" of ocean circulation.
Your DNA gives instructions for your physical structure
Species A and B would be the most similar because there is only one mutation between the two of them located in the first codon.