In a genetic cross between two flowering plants that are heterozygous for the color trait, red flowers (r) are dominant to white flowers (r). what fraction of the offspring should have red flowers?

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.

Which of the following would involve looking at different structures of organisms and comparing how similar they are? a. vestigial structuresb. radiometric datingc. homologous structures

Who discovered tuberculosis bacteria?