Chargaff's Rule = The amount of Thymine always equals the amount of Adenine, and the amount of Cytosine always equals the amount Guanine. BUT WHY?!?!?!
What claim could we make about the type of structure and function of a molecule
called DNA that always has the same amount of Adenine and Thymine and the same
amount of Cytosine and Guanine?
Percentages of Nitrogenous Bases
Organism
%A
%G
%C
%T

The ability to form hydrogen bonds makes the base pairs more stable structurally. The rules of base pairing explain the phenomenon that whatever the amount of adenine (A) in the DNA of an organism, the amount of thymine (T) is the same (Chargaff's rule)

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.