In southwest Rhode Island, there is a creature know as a tomcat. It comes in thr

Question

In southwest Rhode Island, there is a creature know as a tomcat. It comes in three colors, blue, red, and purple. This trait expresses incomplete dominance. A homozygous dominant individual is blue, a homozygous recessive individual is red, and a heterozygous individual is purple.

a. What would be the genotypes and phenotypes of the offspring if a blue tomcat were crossed with a red one?  

b. What are the genotypic ratios of the F2 generation? * Genotypic ratio is recorded as follows: (homozygous dominant : heterozygous : homozygous recessive)

c. If the F2 generation consisted of only 8 individuals, how many tomcats would be purple?

Explanation / Answer

Let us assume the allele responsible for color is “C” if it is dominant and “c” if it is recessive

As per the data given:

CC genotype represents – Blue Tomcat Phenotype

cc genotype represents – Red Tomcat Phenotype

Cc genotype represents – Purple Tomcat Phenotype

Now we will answer the individual question:

a. What would be the genotypes and phenotypes of the offspring if a blue tomcat were crossed with a red one?

Cross:              Blue Tomcat – CC x Red Tomcat – cc

Gametes:         C                     C         c                      c

Punnet Square:

C

C

c

Cc

Cc

c

Cc

Cc

Means, all the genotypes are Cc and Phenotype will be Purple Tomcat

b. What are the genotypic ratios of the F2 generation? * Genotypic ratio is recorded as follows: (homozygous dominant : heterozygous : homozygous recessive)

Genotypic ratio as per the above punnet square: (0:4:0)

c. If the F2 generation consisted of only 8 individuals, how many tomcats would be purple?

As per the above punnet square all the 8 tomcats will be purple in color.

C

C

c

Cc

Cc

c

Cc

Cc

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