Question

How are genotypes used to determine phenotypes?

Answer 1

Genotype means the combination of alleles available for a specific gene in a person.The interaction between these alleles is what determines the phenotype.

Explanation:

For each gene there might be two or more alleles available in the gene pool of the species. Each gene has its own rules of interaction between the alleles. Some have dominance relationship, some have codominance relationship. Some genes interact with other genes, and the number of genes they interact with differs from one gene to another. So the phenotype depends on the alleles available, the type of relationship between them , and whether there is an interaction with other genes or not.