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Polygenic Inheritance

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Questions and Answers

What is the primary characteristic of polygenic inheritance?

Multiple genes have an additive or similar effect on a single quantitative trait (correct)

A single gene has a significant effect on the phenotype

Epistasis is involved, resulting in masking of the expression of an allele at a different locus

There is complete dominance of one allele over another

What is the effect of each allele in polygenic inheritance?

Dominant or recessive

Null or non-contributing

Epistatic or masking

Cumulative or additive (correct)

Which of the following is NOT a characteristic of polygenic inheritance?

Multiple genes produce an equal effect

Continuous variation of the phenotype is observed

Epistasis is involved, resulting in masking of the expression of an allele at a different locus (correct)

There is no linkage or dominance

What is the number of genes responsible for the phenotype of height?

Around 400 genes Signup and view all the answers

What is the number of major eye colour genes in humans?

Two Signup and view all the answers

What type of inheritance is skin pigmentation an example of?

Polygenic inheritance Signup and view all the answers

Study Notes

Polygenic Inheritance

Multiple genes contribute to a single trait.
Each allele has a small, additive effect.
Continuous variation is observed in the phenotype, leading to a range of possibilities rather than distinct categories.
Environmental factors can also influence the trait.
Examples: skin pigmentation, height, eye color

Height

Multiple genes contribute to height.
The exact number is unknown, but estimates suggest hundreds of genes potentially involved.

Eye Color

Multiple genes are involved in eye color.
Recent estimates suggest at least 15 genes, with two major genes playing a significant role.

Skin Pigmentation

Polygenic inheritance is responsible for skin pigmentation variation.
It is influenced by multiple genes, each contributing a small amount of melanin production.

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Description

Test your knowledge of polygenic inheritance, a type of quantitative inheritance where multiple genes have an additive effect on a single trait. Learn about the characteristics of polygenes and how they impact phenotypes. Assess your understanding of this key concept in genetics.