Exploring Incomplete Dominance and Codominance in Punnett Squares

The video tutorial explains how to set up Punnett squares for incomplete 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 genotypes and phenotypes using Punnett squares.

What does it mean when neither trait in a genetic cross is dominant?

• Both traits are dominant

• Both traits are recessive

• One trait is dominant

• Neither trait is dominant or recessive

In incomplete dominance, what color results from a cross between red and white?

• Pink

• White

• Red

• Blue

What is the genotype notation for a pink flower in the discussed example?

• WR

• RW

• WW

• RR

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In codominance, how do the traits express themselves?

• Neither trait expresses

• Through one dominant trait

• Separately in different locations

• By blending together

What is the phenotype ratio from crossing two pink snapdragons?

• 1 red : 2 pink : 1 white

• 2 red : 1 pink : 1 white

• 1 red : 1 pink : 1 white

• All pink

What percentage of the offspring will be red when two pink snapdragons are crossed?

• 75%

• 50%

• 100%

• 25%

Tags

NGSS.HS-LS3-1

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

• White

• Grey

• Patchwork of black and white

• Black

Tags

NGSS.HS-LS3-1

What is the genotype ratio for the offspring of a black and white codominant dog crossed with a white dog?

• All WW

• All BW

• 2 BW : 2 WW

• 1 BW : 1 WW

What percentage of the offspring will be white when a BW dog is crossed with a WW dog?

• 75%

• 100%

• 25%

• 50%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following best describes the expression of traits in codominance?

• Blending of traits

• Suppression of one trait

• Independent expression of both traits

• Random expression of traits