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.

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).

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in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.