Name: ____________________________________

rabbitGenetic Crosses that Involve 2 Traits -- Biology 2

In rabbits, grey hair is dominant to white hair. Also in rabbits, black eyes are dominant to red eyes.

GG = gray hair
Gg = gray hair
gg = white hair
BB = black eyes
Bb = black eyes
bb = red eyes

1. What are the phenotypes (descriptions) of rabbits that have the following genotypes:

Ggbb ____________________ ggBB ________________________
ggbb ____________________ GgBb _________________________

2. A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb The square is set up below. Fill it out and determine the phenotypes and proportions in the offspring.

punnet

How many out of 16 have grey fur and black eyes? ____

How many out of 16 have grey fur and red eyes? _____

How many out of 16 have white fur and black eyes? ____

How many out of 16 have white fur and red eyes? _____

3. A male rabbit with the genotype GgBb is crossed with a female rabbit with the genotype GgBb The square is set up below. Fill it out and determine the phenotypes and proportions in the offspring.

punnet

 

How many out of 16 have grey fur and black eyes? ____

How many out of 16 have grey fur and red eyes? _____

How many out of 16 have white fur and black eyes? ____

How many out of 16 have white fur and red eyes? _____


4. Set this one up on the back of this page. A male rabbit with genotype GgBb x with a female rabbit with genotype ggbb. Show the Punnett square and the expected offspring and their proportions.