Understanding Polygenic Traits in Humans and Dihybrid Crosses

Front

What are polygenic traits?

Back

Polygenic traits are characteristics that are influenced by multiple genes, resulting in a range of phenotypes in a population.

Front

What is a Punnett square used for?

Back

A Punnett square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What fraction of offspring will have wrinkled, yellow seeds in a dihybrid cross if the answer is 3/16?

Back

In a dihybrid cross, the fraction 3/16 indicates that out of 16 possible combinations, 3 will result in the phenotype of wrinkled, yellow seeds.

Front

Which trait is an example of polygenic inheritance?

Back

Eye color is an example of polygenic inheritance, as it is determined by multiple genes.

Front

What is the typical distribution shape of a polygenic trait in a population?

Back

The distribution of a polygenic trait in a population typically forms a bell-shaped curve.

Front

What type of inheritance involves multiple genes and a range of traits?

Back

Polygenic inheritance involves multiple genes and results in a range of traits.

Front

If a person is dominant for all alleles controlling height, what is the expected outcome?

Back

The expected outcome is that the person will be very tall.

Front

What is the difference between codominance and incomplete dominance?

Back

In codominance, both alleles are expressed equally in the phenotype, while in incomplete dominance, the phenotype is a blend of the two alleles.

Front

What is an example of a trait that is not polygenic?

Back

Blood type is not a polygenic trait; it is determined by a single gene.

Front

How do polygenic traits affect genetic diversity?

Back

Polygenic traits contribute to genetic diversity by allowing a wide range of phenotypes within a population.