What are the "rungs" of the DNA ladder made of? a. amino acids
b. pairs of nucleotides
c. sugar-phosphate groups
d. ribonucleic acids
e. nucleic acids

Error analysis: what might be the reason that some of your percentages didn't exactly match your predicted results? gametes aren't responsible for inheritance. mice don't have large litters, so the sample size was not large enough. the wrong type of mice were used.