The only difference in the chemical structure of DNA between various organisms is--- the number of nucleotides present

the order of base pairs

the variety of bases

the number of bases in a codon

the number of nucleotides present

Explanation:

The sequence of nucleotides, and therefore of bases, within an organism's DNA is unique.

hope this helps

the genotypes would be 50% bb and 50% bb

the phenotypes would be 50% brown and 50% white. hope this : )