What happens to the phenotype in F1 generation

The allele for short pea plants is absent from the genotypes in the F1 generation. The allele for short pea plants is masked during the F1 generation, but it is still present in the genotype. The allele for short pea plants is not passed on to the F1 generation.

Explanation:

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?