Codominance & Incomplete Dominance

Front

What is incomplete dominance?

Back

A type of inheritance where the phenotype of the offspring is a mixture of the phenotypes of the parents.

Front

What is codominance?

Back

A type of inheritance where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

Front

If a red flowered plant (RR) is crossed with a white flowered plant (WW) and shows incomplete dominance, what will the offspring look like?

Back

The offspring will have pink flowers (RW).

Front

What is the phenotype of a child with one curly-haired parent and one straight-haired parent if the trait shows incomplete dominance?

Back

The child will have wavy hair.

Front

In a cross between a brown-haired (A) and a blond-haired (a) parent, what is the expected phenotype ratio of the offspring if brown is dominant?

Back

75% Brown Hair and 25% Blond Hair.

Front

What does it mean if a trait is said to be dominant?

Back

It means that the trait will be expressed in the phenotype even if only one dominant allele is present.

Front

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

Back

0% will have red flowers.

Front

How can you identify codominance in a genetic cross?

Back

By observing that both traits appear simultaneously in the phenotype, such as a flower with both red and white petals.

Front

What is the difference between complete dominance and incomplete dominance?

Back

In complete dominance, the dominant allele completely masks the effect of the recessive allele, while in incomplete dominance, the traits blend.

Front

If a plant with genotype Rr is crossed with another Rr plant, what are the possible genotypes of the offspring?

Back

RR, Rr, Rr, rr.