Understanding Dominance in Genetics

What is the main difference between codominance and incomplete dominance?

• In codominance, both alleles are fully expressed, while in incomplete dominance, the alleles blend to form an intermediate phenotype.

• In codominance, one allele is dominant over the other, while in incomplete dominance, both alleles are equally expressed.

• In codominance, alleles blend to form an intermediate phenotype, while in incomplete dominance, both alleles are fully expressed.

• In codominance, neither allele is expressed, while in incomplete dominance, one allele is fully expressed.

In a cross between a red flower (RR) and a white flower (WW) showing incomplete dominance, what would be the phenotype of the offspring?

• Red

• White

• Pink

• Red and white patches

Tags

NGSS.MS-LS3-2

In a codominant cross between a black chicken (BB) and a white chicken (WW), what would be the phenotype of the offspring?

• Black

• White

• Gray

• Black and white speckled

Tags

NGSS.HS-LS3-1

Which of the following is an example of codominance?

• A pink flower resulting from a red and white flower cross

• A roan cow with both red and white hairs

• A green pea plant from a yellow and blue pea plant cross

• A tall plant from a tall and short plant cross

If a heterozygous pink flower (RW) is crossed with a white flower (WW) in incomplete dominance, what is the probability of getting a pink flower?

• 1

Tags

NGSS.HS-LS3-3

In a codominant cross between a red cow (RR) and a roan cow (RW), what is the probability of getting a roan cow?

• 1

Tags

NGSS.HS-LS3-3

Which of the following Punnett squares represents a cross showing incomplete dominance?

• RR x WW resulting in RW, RW, RW, RW

• RR x WW resulting in RR, RW, RW, WW

• RR x WW resulting in RR, RR, WW, WW

• RR x WW resulting in RW, RW, RW, RW

In a cross between two roan cows (RW x RW) showing codominance, what is the probability of getting a white cow?

• 0

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following statements is true about incomplete dominance?

• The dominant allele completely masks the recessive allele.

• The phenotype is a blend of both alleles.

• Both alleles are fully expressed in the phenotype.

• Only one allele is expressed in the phenotype.

In a cross between a red flower (RR) and a pink flower (RW) showing incomplete dominance, what is the probability of getting a red flower?

• 1

Tags

NGSS.HS-LS4-3