Incomplete Dominance Codominance

Front

What is incomplete dominance?

Back

Incomplete dominance is 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.

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What is codominance?

Back

Codominance is a genetic situation in which both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that shows both traits simultaneously.

Front

In a cross between a red flowered plant (RR) and a white flowered plant (WW) exhibiting incomplete dominance, what will be the phenotype of the offspring?

Back

The offspring will have pink flowers (RW), as the traits blend.

Front

What is the phenotypic ratio of a cross between a red flower (F^RF^R) and a speckled flower (F^RF^B) in codominance?

Back

The phenotypic ratio will be 50% red and 50% speckled.

Front

What is an example of incomplete dominance in animals?

Back

An example of incomplete dominance in animals is the coat color of rabbits, where a long-haired rabbit crossed with a short-haired rabbit produces offspring with medium-length fur.

Front

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

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0% red flowers; all offspring will be pink (RW).

Front

What type of inheritance is shown by a calico cat?

Back

Calico cats exhibit codominance, showing both orange and black fur traits.

Front

How does incomplete dominance differ from complete dominance?

Back

In complete dominance, one allele completely masks the effect of another, while in incomplete dominance, the traits blend to form a new phenotype.

Front

What is the significance of the F^R and F^B alleles in flower color?

Back

F^R represents the allele for red flowers, and F^B represents the allele for blue flowers; together they can produce speckled flowers in codominance.

Front

Can you give an example of a trait that exhibits codominance in plants?

Back

An example of codominance in plants is the flower color in certain varieties of snapdragons, where red and white flowers can produce red and white striped flowers.