Complex Inheritance

Front

What is Incomplete Dominance?

Back

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.

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 are Multiple Alleles?

Back

A situation in which three or more alleles exist for a particular gene, leading to a variety of possible phenotypes.

Front

What are Polygenic Traits?

Back

Traits that are controlled by two or more genes, often resulting in a continuous range of phenotypes.

Front

What is the phenotype of a bubble guppy with a yellow tail crossed with a red tail guppy?

Back

The offspring have orange tails, demonstrating Incomplete Dominance.

Front

What color flowers result from crossing a red snapdragon (RR) with a white snapdragon (R'R')?

Back

The flowers that are RR' will be pink, showing Incomplete Dominance.

Front

What is the genotype of a person with type A blood whose father has type O blood?

Back

The genotype is I^A i.

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 traits blend.

Front

Give an example of Codominance in humans.

Back

AB blood type, where both A and B alleles are expressed.

Front

What is a trait?

Back

A characteristic or feature of an organism, which can be influenced by genetics.