Genetics of Incomplete Dominance and Codominance in Plants and Animals

The video tutorial explains how to set up Punnett squares for incomplete dominance and codominance. Incomplete dominance involves a blending of traits, while codominance results in both traits being expressed. Examples include snapdragons for incomplete dominance and dogs for codominance. The video demonstrates how to calculate genotypic and phenotypic ratios using Punnett squares.

What is a key characteristic of incomplete dominance?

• Lowercase letters are used to denote recessive traits.

• Traits blend to form an intermediate phenotype.

• Traits are expressed in separate locations.

• One trait is completely dominant over the other.

In the context of incomplete dominance, what would be the phenotype of a flower with the genotype RW?

• Yellow

• Pink

• White

• Red

What is the genotype ratio for a cross between two pink Snapdragon flowers?

• 2:2

• 3:1

• 1:2:1

• 1:1:1

In the Snapdragon example, what percentage of the offspring are expected to be white?

• 75%

• 50%

• 25%

• 0%

How are traits expressed in codominance?

• One trait is masked by the other.

• Traits blend to form a new phenotype.

• Both traits are expressed simultaneously in different locations.

• Only one trait is visible.

In the dog example, what is the phenotype of a dog with the genotype BW?

• Patchwork of black and white

• Black

• Gray

• White

What is the genotype ratio for a cross between a black and white dog and a white dog?

• 3:1

• 1:2:1

• 1:1

• 2:2

In the codominance example, what percentage of the offspring are expected to have a patchwork phenotype?

• 25%

• 100%

• 0%

• 50%

Which of the following is true about codominance?

• It uses lowercase letters for recessive traits.

• One trait is dominant over the other.

• Both traits are expressed equally.

• It involves blending of traits.

What is the phenotype of a dog with the genotype WW in the codominance example?

• Patchwork of black and white

• White

• Black

• Gray