Polygenic inheritance refers to the interaction of ___ genes contributing to a single trait.

Multiple

True or False: Polygenic inheritance involves the masking of gene expression at different loci.

False. Polygenic inheritance does not involve epistasis.

Continuous variation in traits is a characteristic of ___ inheritance.

Polygenic

What is an example of a trait that follows polygenic inheritance?

Height, skin color, and eye color are examples of traits that follow polygenic inheritance.

Fill in the blank: The inheritance of skin color is influenced by around ___ genetic loci.

60

True or False: The ABO blood group system is an example of polygenic inheritance.

False. The ABO blood group system is controlled by multiple alleles at a single locus, not polygenic inheritance.

Define polygenic inheritance.

Polygenic inheritance is defined as quantitative inheritance, where multiple independent genes have an additive effect on a single quantitative trait.

Fill in the blank: In polygenic inheritance, each gene contributes a ___ effect to the final phenotype.

Small

What is the ratio of phenotypes in offspring from a cross involving two AaBbCc individuals?

The ratio of skin color phenotypes in offspring will follow a pattern of 1:6:15:20:15:6:1.

Polygenic inheritance is primarily responsible for the variation observed in traits such as ___ and ___.

Human height and skin pigmentation

True or False: The expression of polygenic traits is solely determined by genetic factors.

False. Environmental factors also significantly influence the expression of polygenic traits.

What does the term 'norm of reaction' refer to in the context of polygenic inheritance?

The range of possible phenotypes that can occur under various environmental conditions for a single genotype.

Fill in the blank: The color of a Hydrangea shrub's flowers is determined by the amount of ___ present in the soil.

Aluminum

In polygenic inheritance, how many genes approximately influence the color of human eyes?

At least 16 genes.

True or False: All traits governed by polygenic inheritance show discrete phenotypic categories.

False. Polygenic inheritance leads to continuous variation of phenotypes.

Polygenic inheritance involves multiple genes contributing to a single trait, such as ___ and ___.

Height and skin pigmentation

True or False: Polygenic inheritance is characterized by discrete categories of traits.

False; polygenic inheritance is characterized by continuous variation of traits.

Fill in the blank: Polygenic inheritance is also known as ___ inheritance.

Multiple gene

What is the main characteristic that distinguishes polygenic inheritance from single-gene inheritance?

Polygenic inheritance involves multiple genes.

• Involves many genes.

• Contributes to phenotype variations.

• Leads to continuous traits.

True or False: Epistasis is a key feature of polygenic inheritance.

False; polygenic inheritance does not involve epistasis.