What is meant by variable expressivity in genetics?

A The product of one gene controls the expression of another gene.

B A certain percentage of individuals with a particular genotype fail to express the associated phenotype.

C A single genotype produces a range of phenotypes that differ in the degree or magnitude of expression of the particular trait specified by the gene.

D A single genotype produces multiple distinct phenotypes that affect different functions.

Question

Clayton

Biology

10 June, 15:04

What is meant by variable expressivity in genetics?

A The product of one gene controls the expression of another gene.

B A certain percentage of individuals with a particular genotype fail to express the associated phenotype.

C A single genotype produces a range of phenotypes that differ in the degree or magnitude of expression of the particular trait specified by the gene.

D A single genotype produces multiple distinct phenotypes that affect different functions.

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Answers (1)

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Lane · Answer 1

C A single genotype produces a range of phenotypes that differ in the degree or magnitude of expression of the particular trait specified by the gene.

Explanation:

Variable expressivity refers to the range of signs and symptoms that can occur in different people with the same genetic condition.

For example, the features of Marfan syndrome vary widely - some people have only mild symptoms (such as being tall and thin with long, slender fingers), while others also experience life-threatening complications involving the heart and blood vessels. Although the features are highly variable, most people with this disorder have a mutation in the same gene (FBN1).