AP BIOLOGY

Detailed explanation-1: -Chargaff’s rules states that DNA from any cell of all organisms should have a 1:1 ratio of pyrimidine and purine bases and, more specifically, that the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine.

Detailed explanation-2: -Chargaff’s rule states that the amount of adenine (A) is equal to that of thymine (T) and the amount of guanine is equal to that of cytosine (C) in an organism.

Detailed explanation-3: -Explanation: There are four bases in DNA: adenine, thymine, guanine, and cytosine. Adenine always pairs with thymine, so the number of adenine residues always equals the number of thymine residues. Guanine always pairs with cytosine, which means they are always present in equal amounts as well.

Detailed explanation-4: -It specifies that the amounts of guanine and cytosine be the same. While the ratios of adenine and thiamine are the same. This rule was named after Erwin Chargaff, who discovered it in 1950. According to this model, the percentage of nitrogenous base pairs is equal to the percentage of double-stranded DNA.

Detailed explanation-5: -Chargaff’s rules explain a natural 1:1 ratio between the nucleotide pair adenine and thymine and the pair cytosine and guanine.