Incomplete and Codominance Checkpoint

Coat color in mice is incompletely dominant. Yellow (YY) and white-colored (WW) mice are homozygous, while cream-colored mice are heterozygous. If two cream-colored mice mate, what phenotypic ratio can we expect of their offspring? (Y= yellow coat allele, W= white coat allele)

• 2 YY: 2 WW

• 1 YY: 2 YW: 1 WW

• 1 YY: 3 WW

• 2 YY: 1 YW: 1 WW

Tags

NGSS.HS-LS3-1

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In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (W).

A pink-flowered plant is crossed with a white-flowered plant. Draw and fill out your Punnett square. What is the probability of producing a pink-flowered plant?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted).

Two erminette chickens (BW) were crossed. What percent of their offspring would have black feathers?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In shorthorn cattle, when a red bull (RR) is crossed with a white cow (WW), all the offspring are roan(RW)-a spotted, red and white or milky red color. What is the genotypic ratio for the offspring from mating a red bull and a roan cow?

• 1 RR: 2 RW: 1 WW

• 2 RR: 2 RW

• 3 RR: 1 WW

• All RW

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What type of inheritance do two alleles have if their traits blend together? 

• Incomplete Dominance
• Co-Dominance

This is an example of ___________?

• Incomplete dominance
• Co-Dominance

If you cross a black chicken with a white chicken, only checkered chickens would be produced.  What kind of inheritance pattern does this follow?

• incomplete Dominance
• Co-Dominance

Tags

NGSS.HS-LS3-1