Q: In fruit flies the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. What are the possible combinations of genes in the offspring of two red-eyed heterozygous flies (Rr)?
In fruit flies the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. What are the possible combinations of genes in the offspring of two red-eyed heterozygous flies (Rr)?
Flexi Says: The possible combination of genes in the offspring of two red-eyed heterozygous flies is RR, Rr, and rr. There can be 1 homozygous red-eyed phenotype, 2 heterozygous red and sepia-eyed phenotype, and 1 homozygous sepia-eyed phenotype. Therefore the genotypic ratio of Rr x Rr is 1:2:1.
