5b
3. Fruit flies are organisms commonly used in genetic studies. They reproduce pickly
and have several traits that can be measured. One trait is the vestigial wing (g) trait,
which is recessive. Most flies have red eyes (E), but the sepia eye (e) trait is recessive.
The image to the right shows a mutant double recessive fly (ggee).
A fly that is heterozygous for both traits (GgEe) is crossed with one that has vestigial
wings and sepia eyes (ggee).
a. Set up a Punnett square and list the phenotypic ratio of the original square