Answer Happy

Which one of the following is an example of epistasis? An allele for brown hair is dominant over an allele for red hair Drosophila flies heterozygous for a bent wing mutation produce offspring, 75% of which are wild type and 25% of which have bent wings Two Drosophila mutants, each defective in a single different gene, produce wings half normal length. Double mutants, defective in both genes, also produce flies with wings half normal length. A homozygous yellow eye mutant fly (genotype y y) crossed to a homozygous bent wing mutant fly (genotype bw bw) produces only offspring with a wild type phenotype (red eyes and straight wings) A female Drosophila homozygous for a short legged mutation bred to a wild type male produced 50 offspring; 25 daughters with normal legs and 25 sons with short legs