If chromosome is like a book the a gene is like a

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

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

Which of these structures are found in both plant ans animal cells?