Incomplete Dominance and Codominance

Front

What is incomplete dominance?

Back

A genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two traits.

Front

What is codominance?

Back

A genetic situation where both alleles for a gene are fully expressed in the offspring, resulting in a phenotype that shows both traits simultaneously.

Front

What is the phenotypic ratio when a red flower (F^RF^R) is crossed with a speckled flower (F^RF^B)?

Back

50% red, 50% speckled.

Front

In codominance, how do the traits appear in the offspring?

Back

Both traits are expressed simultaneously, such as in calico cats where both black and tan colors are visible.

Front

What is the result of crossing a red flowered plant (RR) with a white flowered plant (WW) under incomplete dominance?

Back

0% of the offspring will have red (RR) flowers; all will be pink (RW).

Front

What is the inheritance pattern where neither allele is dominant, resulting in a blend of traits?

Back

Incomplete dominance.

Front

What percentage of offspring will be calico (black and tan spotted) when calico cats are crossed?

Back

50% of the offspring will be calico.

Front

What is the difference between codominance and incomplete dominance?

Back

In codominance, both traits are fully expressed; in incomplete dominance, the traits blend to form a new phenotype.

Front

What is an example of codominance in animals?

Back

Calico cats, which exhibit both black and tan fur.

Front

What is the expected phenotypic ratio from a cross between two heterozygous codominant flowers (F^RF^B)?

Back

1 red: 1 blue: 2 speckled.