Answer:
Chargaff's rules state that DNA from any species of any organism should have a 1:1 protein stoichiometry ratio of purine and pyrimidine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine
Mass number = protons + neutrons
If you have the # of protons and the mass #, subtract the number of protons from the mass number to get the number of neutrons.
If you have the number of neutrons and the mass number, subtract the number of neutrons from the mass number to get the number of protons.
The answer is going to be B. 50 percent because there is an 50/50 chance the child will have a widows peak