Name:____________________________________________Date: _______

Genetics Practice: Codominance and Incomplete Dominance

cow

In cows, red and white coloraton alleles are codominant . A cow that has both alleles will be ROAN (spotted with red & white patches).

RR = red         WW = white       RW = roan

1. A roan cow is crossed with a red cow.

What percent of the offspring will be red? _____

 

 

2. A red cow is crossed with a white cow.

What percent of the offspring will be roan? _____

 

 

3. A roan cow is crossed with a white cow.

What percent of the offspring will be roan? _____

What percent will be red? ____

What percent will be white?_____

 


snapdragon

In snapdragon flowers, the allele for flower color shows incomplete dominance.

Flowers can be red (RR), white (WW), or pink (RW).

4. Two pink flowers are crossed, how many offspring are:

Red? ________
White?________
Pink ?_________

 

5. A red flower is crossed with a pink flower, how many offspring are:

Red? ________
White?________
Pink ?_________

 

6. In your own words, explain the difference between codominance and incomplete dominance .
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