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.

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).