In fruit flies, long wing (L) is dominant, vestigial wing (l) is recessive, gray body (G) is dominant, ebony body (g) is recessive. Two fruit flies were mated that were long-winged with gray bodies. The genotype of these two parental flies is LlGg * LlGg. What proportion of the offspring flies would have long wings and gray bodies?

Question

Quizplus · Accepted Answer

Since both parents are heterozygous for both traits (LlGg), a dihybrid cross can be used to determine the offspring's phenotypes. The phenotypic ratio for a dihybrid cross of two heterozygotes is 9:3:3:1, where 9 represents the offspring with both dominant traits (long wings and gray bodies). Therefore, nine out of sixteen offspring, or nine-sixteenths, would have long wings and gray bodies.

In Fruit Flies, Long Wing (L) Is Dominant, Vestigial Wing