Codominance & Incomplete Dominance

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic situation where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes.

Front

What are genotypes?

Back

Genotypes are the genetic constitution of an individual, represented by the alleles inherited from the parents.

Front

What is the phenotype of an organism?

Back

The phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

If a tall plant (TT) is crossed with a short plant (tt), what are the possible genotypes of the offspring?

Back

The possible genotypes are TT (25%), Tt (50%), and tt (25%).

Front

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

Back

The expected phenotype ratio is 75% Brown Hair and 25% Blond Hair.

Front

What is an example of incomplete dominance in humans?

Back

An example of incomplete dominance in humans is the blending of red and white flower colors to produce pink flowers.

Front

What is the result of a cross between a curly-haired parent and a straight-haired parent?

Back

The result is a child with wavy hair, demonstrating incomplete dominance.

Front

What percentage of offspring will be black if incomplete dominance occurs in cats with black, white, and gray fur?

Back

50% of the offspring will be black.

Front

What is the difference between complete dominance and codominance?

Back

In complete dominance, one allele completely masks the effect of another, while in codominance, both alleles are expressed equally.