In gel electrophoresis, an electrical current is used to separate different sizes of DNA molecules. What size is found
at the bottom of a gel?
a. the shorter DNA molecules
b. the longer DNA molecules

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.