Codominance & Incomplete Dominance Worksheet

 

  1. In horses a roan coat (RW) is the result of codominance between a red (RR) and a white coat (WW).  What is the chance of 2 roan horses will produce a white horse?

 

 

 

 

 

           

            Percent:

 

  1. In the same horses as question #1, cross a red horse with a white horse.

What would the expected genotypic and phenotypic ratios be?

 

 

 

 

 

 

Genotypic ratio:                                                            Phenotypic ratio:

 

 

  1. In snapdragons, red (R) is incompletely dominant over white (r) which produces pink flowers in the heterozygote .   If a red snapdragon and a white snapdragon are crossed what would the expected genotypic and phenotypic rations be?

 

 

 

 

 

Genotypic ratio:                                                Phenotypic ratio:

 

  1. In the same snapdragons as question #3, cross 2 pink snapdragon plants.  What would the expected genotypic and phenotypic ratios be?

 

 

 

 

 

 

Genotypic ratio:                                                            Phenotypic ratio:

 


  1. Some chickens show incomplete dominance.  When a black (BB) chicken is crossed with a white (bb) chicken the result is a blue chicken (Bb). What is the percentage that a black and white chicken will have black offspring?

 

 

 

 

 

Percentage: