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 the described trait to the total
number of offspring:
Brown body and red eyes
Brown body and brown eyes
Black body and red eyes
Black body and brown eyes

Answer 1

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)

Step-by-step explanation:

Answer 2

Brown body and red eyes ⇒ 9 ⇒ 16

Brown body and brown eyes ⇒ 3 ⇒ 16

Black body and red eyes ⇒ 3 ⇒ 16

Black body and brown eyes ⇒ 1 ⇒ 16