Incomplete Dominance and CoDominance

When one allele is not dominant over another, resulting in a blended phenotype for heterozygous offspring is considered....

• Incomplete Dominance

• Codominance

When one allele is not dominant over the other, resulting in both traits expressed in a heterozygous individual.....

• Incomplete Dominance

• Codominance

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).

Cross a red flower with a speckled flower. What is the phenotypic ratio?

• 2 red, 2 speckled

• 2 red, 2 blue

• 2 blue, 2 speckled

Tags

NGSS.HS-LS3-3

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).

Cross two speckled flowers.

• 1 red, 2 speckled, 1 blue

• 2 red, 2 blue

• 2 blue, 2 speckled

• 1 red, 1 speckled, 2 blue

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

NGSS.HS-LS3-2

In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).  
Cross a black fowl with a white fowl. What is the phenotype ratio?

• 4 black: 0 grey: 0 white
• 2 black: 2 grey: 0 white
• 0 black: 4 grey: 0 white
• 0 black: 2 grey: 2 white

Tags

NGSS.HS-LS3-3

In chickens, feather color is codominant.  If a black chicken BB is mated with one that is black and white (BW) what are the chances of having a chicken that is black and white?

• 50%
• 0%
• 25%
• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

The hair form gene shows incomplete dominance. Straight hair (SS) is dominant, curly hair (CC) is recessive, and wavy hair (SC) is heterozygous. Mr. and Mrs. Anderson both have wavy hair (SC). What percentage of their children will also have wavy hair (SC)?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have red (RR) flowers?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

A tall plant (TT) is crossed with a short plant (SS). The result is a medium plant (TS). This is what type of inheritance pattern?

• Incomplete dominance

• Codominance

A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3