The correct answer for the given question above would be the first option. According to Chargaff's rule, base pairing in DNA should resemble this: A = T; C = G. Chargaff's rules states that DNA from any cell of all organisms should have a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases. Hope this answers the question.
To answer your question the least likely way for genetic variation in living organisms is <span> to alter allele and genotype frequencies in a few</span>
