NonMendelian_Incomplete Dominance and codominance_2024

Front

What is codominance?

Back

Codominance is a type of inheritance pattern where both alleles in a heterozygous organism contribute equally and visibly to the organism's phenotype. For example, in flowers, red (RR) and white (WW) alleles can produce speckled flowers (RW).

Front

What is incomplete dominance?

Back

Incomplete dominance is an inheritance pattern where neither allele is completely dominant over the other, resulting in a blending of traits. For example, crossing a red flower (RR) with a white flower (WW) may produce pink flowers (RW).

Front

What is the phenotypic ratio of a cross between a red flower (RR) and a white flower (WW) under codominance?

Back

The phenotypic ratio is 1 red (RR) : 1 white (WW) : 2 speckled (RW).

Front

What is the phenotypic ratio of a cross between a red flower (RR) and a white flower (WW) under incomplete dominance?

Back

The phenotypic ratio is 1 red (RR) : 2 pink (RW) : 1 white (WW).

Front

What is the expected percentage of red flowers from a cross between RR and WW under incomplete dominance?

Back

0% of the offspring will have red (RR) flowers.

Front

What type of inheritance pattern shows both traits in the offspring?

Back

Co-dominance shows both traits in the offspring.

Front

What do you call the inheritance pattern where traits blend together?

Back

This is called incomplete dominance.

Front

Give an example of co-dominance in animals.

Back

A calico cat shows both orange and black fur, demonstrating co-dominance.

Front

What is the difference between complete dominance and co-dominance?

Back

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

Front

What is the expected outcome of a cross between two heterozygous individuals (RW x RW) under co-dominance?

Back

The expected outcome is 1 red (RR) : 2 speckled (RW) : 1 white (WW).