Multiple Alleles and Polygenic Traits

Front

What are multiple alleles?

Back

A single gene that has three or more different forms (alleles).

Front

What is polygenic inheritance?

Back

A type of inheritance where multiple genes influence a trait, resulting in a continuous range of phenotypes, such as skin color and height.

Front

What is the genotype for a person who is heterozygous for type A blood?

Back

AO

Front

If a father has genotype AA and a mother has genotype AB, what is the probability of their child having AB blood?

Back

50%.

Front

Can two parents with type AB blood have a child with type O blood?

Back

No, the probability is 0%.

Front

What is codominance?

Back

A genetic scenario where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

Front

What is an example of a trait that is influenced by multiple alleles?

Back

Blood type in humans, which can be A, B, AB, or O.

Front

What is a polygenic trait?

Back

A trait that is controlled by two or more genes, leading to a wide range of phenotypes.

Front

What is the difference between multiple alleles and polygenic traits?

Back

Multiple alleles refer to a single gene with more than two allele forms, while polygenic traits involve multiple genes affecting a single trait.

Front

What is the expected phenotypic ratio for a monohybrid cross involving a trait with complete dominance?

Back

3:1 ratio.