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. Example: In flowers, red (RR) and blue (BB) alleles can produce speckled flowers (RB).

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic scenario where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes. Example: A red flower (RR) crossed with a white flower (WW) may produce pink flowers (RW).

Front

What is the phenotypic ratio of a cross between two speckled flowers (RB x RB)?

Back

1 red, 2 speckled, 1 blue.

Front

What is the phenotypic ratio of a cross between a red flower (RR) and a speckled flower (RB)?

Back

2 red, 2 speckled.

Front

What type of allele expression is shown by a calico cat with both orange and black fur?

Back

Co-dominance.

Front

If a flower has the genotype RB, what color will it be?

Back

Speckled.

Front

In a cross between a red flower (RR) and a blue flower (BB), what will be the genotype of the offspring?

Back

All offspring will be RB (speckled).

Front

What is the difference between codominance and incomplete dominance?

Back

In codominance, both alleles are fully expressed in the phenotype, while in incomplete dominance, the phenotype is a blend of the two alleles.

Front

What is an example of incomplete dominance in plants?

Back

A red flower (RR) crossed with a white flower (WW) produces pink flowers (RW).

Front

What is the expected outcome of crossing two homozygous red flowers (RR)?

Back

All offspring will be red (RR).