What is the difference between genotype and phenotype?

What is the difference between genotype and phenotype?

A.The genotype is the genetic makeup; the phenotype is how genes are expresseD.

B.The phenotype is the genetic makeup; the genotype is how genes are expresseD.

C.Genotype is a visible expression of the genes; phenotype is a behavioral expression.

D.Genotype is the wild type; phenotype is the mutant form.

正确答案是A