An A '''recessive allele''' is an [[allele]] that will not determine the phenotype unless the genotype is [[homozygous]] with that allele.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia
Educational Ministries, Inc. 1998</ref> Examples of recessive alleles include the allele for green in the pea [[Pisum sativum]](what [[Gregor Mendel]] originally did his experiments on). In humans a variety of inherited diseases are recessive. Examples include [[Cystic fibrosis]] and [[Tay-Sachs]].