Incomplete and Codominance Practice

Front

What is incomplete dominance?

Back

A pattern of inheritance where the phenotype of heterozygotes is intermediate between the phenotypes of the two homozygotes.

Front

What is codominance?

Back

A pattern 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 phenotype results from codominance in flowers with genotypes RR (red) and BB (blue)?

Back

Speckled blue and red (RB).

Front

What is a recessive allele?

Back

An allele whose trait only shows up when no dominant allele is present.

Front

What phenotype results from incomplete dominance in cats with genotypes BB (black) and bb (white)?

Back

Grey (Bb).

Front

What is the difference between complete dominance and incomplete dominance?

Back

In complete dominance, the dominant allele completely masks the effect of the recessive allele, while in incomplete dominance, the heterozygote shows a blend of both traits.

Front

Give an example of codominance in animals.

Back

In certain breeds of cattle, a red (RR) and white (WW) parent can produce offspring with both red and white patches (RW).

Front

What is the genotype of a heterozygous individual?

Back

An individual with two different alleles for a specific gene, represented as Aa.

Front

What is the phenotype of a homozygous dominant individual with genotype AA?

Back

The phenotype will express the dominant trait.

Front

What is the expected phenotype ratio in a monohybrid cross of two heterozygous individuals (Aa x Aa)?

Back

1:2:1 ratio of genotypes and a 3:1 ratio of phenotypes.