Incomplete Dominance and Codominance

Front

What is incomplete dominance in genetics?

Back

Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a phenotype that is a blending of the two traits.

Front

What is codominance in genetics?

Back

Codominance is a genetic situation in which both alleles in a heterozygous organism contribute to the phenotype, resulting in both traits being expressed simultaneously.

Front

If a plant with genotype RR is crossed with a plant with genotype WW, what will be the genotype of the offspring?

Back

The offspring will all have the genotype RW.

Front

What phenotype will result from a cross between a homozygous straight-haired (SS) and a homozygous curly-haired (CC) individual?

Back

The phenotype of the offspring will be wavy hair (SC).

Front

In a cross between two wavy-haired individuals (SC), what is the probability of producing a straight-haired offspring?

Back

The probability of producing a straight-haired offspring is 25%.

Front

What is the expected phenotype ratio of offspring from a cross between two heterozygous individuals (SC)?

Back

The expected phenotype ratio is 1 straight-haired : 2 wavy-haired : 1 curly-haired.

Front

How does incomplete dominance differ from codominance?

Back

In incomplete dominance, the traits blend together in the phenotype, while in codominance, both traits are fully expressed and visible.

Front

What is the phenotype of offspring when a black chicken (BB) is crossed with a white chicken (WW) under codominance?

Back

The offspring will have black and white feathers (BW).

Front

What percentage of offspring will have pink flowers when a red flowered plant (RR) is crossed with a white flowered plant (WW) under incomplete dominance?

Back

100% of the offspring will have pink flowers (RW).

Front

What is the expected percentage of curly-haired offspring from a cross between two wavy-haired individuals (SC)?

Back

The expected percentage of curly-haired offspring is 25%.