A. the influence of environment on the expression of a particular genotype. B. the expression of a dominant phenotype in a heterozygote. C. the expression of one gene masking the effects of another gene. D. quantitative traits that diminish or intensify a particular phenotype. E. the increased expression of a particular trait when a hybrid species is formed.

The question is incomplete, the complete question is;

Penetrance and expressivity are related to

A.the expression of a dominant phenotype in a heterozygote.

B.the increased expression of a particular trait when a hybrid species is formed.

C.the expression of one gene masking the effects of another gene.

D.quantitative traits that diminish or intensify a particular phenotype.

E.the influence of environment on the expression of a particular genotype.

the influence of environment on the expression of a particular genotype.

Explanation:

In genetics, we define penetrance as the proportion of individuals in a given population carrying a particular gene/allele which leads to the expression of the particular trait associated with that gene/allele.

Expressivity is defined as the degree of expression of a given phenotype  by individuals who possess a particular genotype. Expressivity shows the extent of variation in expression of genes by individuals having a particular genotype.

Both penetrance and expressivity has to do with the influence of environment on the expression of a particular genotype.

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