Question

Two fruit flies that are heterozygous for body color and eye color are crossed. Brown body color is dominant to black body color. Red eye color is dominant to brown eye color. Use the Punnett square to determine the ratio of offspring with: Brown body and red eyes : Brown body and brown eyes : Black body and red eyes : Black body and brown eyes :

Answer 1

In a double cross of two heterozygotes for both traits ( BrBl  Rbx BrBl  Rb) we would get a 9:3:3:1 phenotypic ratio.
9 Brown body, red eyes (both dominant traits)
3 brown body, brown eyes (one dominant, one recessive trait)
3 black body, red eyes ( one recessive and one dominant trait)
1 black body, brown eyes ( both recessive traits)

Answer 2

Answer: 9:16, 3:16, 3.16, 1:16

Explanation: