Genetics Practice: Codominance and Incomplete Dominance

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?_____

 

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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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