What is a gene?
a. a section of a protein that codes for dna
b. the alternate version of a trait
c. the visible trait in the f1 generation
d. a section of dna that codes for a specific trait
think its d but i'm not sure..

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different