Question

who determined the percentage of adenine (a) in the dna always equaled the percentage of thymine (t), and the percentage of guanine (g) always equaled the percentage of cytosine (c).
a james watson
b rosalind franklin and maurice wilkins
c gregor mendel
d erwin chargaff

Explanation:

Erwin Chargaff discovered that in DNA, the amount of adenine (A) equals thymine (T) and the amount of guanine (G) equals cytosine (C). This is known as Chargaff's rules. James Watson is known for co - discovering the double - helix structure of DNA with Francis Crick. Rosalind Franklin and Maurice Wilkins contributed to the X - ray crystallography of DNA. Gregor Mendel is the father of modern genetics, known for his work on inheritance in pea plants.

Answer:

d. Erwin Chargaff