Incomplete and Codominance

Front

What is codominance?

Back

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

A genetic scenario where the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes.

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

In a cross between a red flower (RR) and a white flower (WW) exhibiting incomplete dominance, what percentage of the offspring will have red flowers?

Back

0%.

Front

What is the phenotypic outcome of a cross between a black cat (BB) and a white cat (WW) under incomplete dominance?

Back

50% gray cats.

Front

How does incomplete dominance differ from codominance?

Back

In incomplete dominance, the heterozygote shows a blend of traits, while in codominance, both traits are fully expressed.

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What is the expected phenotypic ratio in a typical Mendelian cross?

Back

Typically 3:1 for dominant to recessive traits.

Front

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

Back

A dominant trait is one that will express its phenotype even in the presence of a recessive allele.

Front

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

Back

A recessive trait is one that will only express its phenotype when two copies of the recessive allele are present.