Incomplete and Codominance

Front

What is incomplete dominance?

Back

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

Front

What is codominance?

Back

A form of inheritance where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

Front

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

Back

1 red (RR), 2 pink (RW), 1 white (WW) - 0% red flowers.

Front

What is the expected phenotypic ratio when crossing two roan cows (RW)?

Back

1:2:1 ratio - 1 red (RR), 2 roan (RW), 1 white (WW).

Front

In a cross between a red flower (RR) and a speckled flower (RB), what are the possible offspring?

Back

50% red (RR), 50% speckled (RB).

Front

What is the expected outcome of crossing two speckled flowers (RB)?

Back

1 red (RR), 2 speckled (RB), 1 blue (BB).

Front

How does codominance differ from incomplete dominance?

Back

In codominance, both traits are fully expressed, while in incomplete dominance, the traits blend together.

Front

What is the genotype of a purple radish that is heterozygous for color?

Back

The genotype is Rr, where R is the allele for red and r is the allele for white.

Front

If a red radish (RR) is crossed with a purple radish (Rr), what is the expected genotypic ratio?

Back

1 RR (red), 1 Rr (purple).

Front

What is the definition of a pure breeding organism?

Back

An organism that, when mated with another of the same genotype, will produce offspring with the same phenotype.