Practice: Codominance and Incomplete Dominance

1. Practice setting up keys for the phenotypes listed in each set. Remember that the "medium" trait must always be heterozygous.

a) Eggplants can be deep purple, white, or a light violet color.

b) Flowers can be white, pink, or red.

c) Cows can be black, white, or a mix of black and white

2. Now, can you figure out in the above list, which of the letters represent codominant traits and which are incomplete.

Codominant _____________ Incomplete Dominance ________________

3. In Smileys, eye shape can be starred, circular, or a circle with a star. Write the genotypes for the pictured phenotypes

 

4. Show the cross between a star-eyed and a circle eyed.

What are the phenotypes of the offspring? ____________

What are the genotypes? __________

 

5. Show the cross between a circle-star eyed, and a circle eyed.

How many of the offspring are circle-eyed? ____________

How many of the offspring are circle-star eyed? ____________

 

6. Show the cross between two circle-star eyed.

How many of the offspring are circle-eyed? ____________

How many of the offspring are circle-star eyed? ____________

How many are star eyed? ____________