Fig 1. Phenotypes of pigeons carrying Almond alleles (St, Almond allele; +, wild type allele).

(A) Heterozygous Almond male. (B) Hemizygous Almond female. (C) Homozygous Almond male. (D) Almond females have no observable eye defects. (E) Homozygous Almond males often show severe eye defects. Defects pictured in this juvenile include bloated eyelid and anterior opacity. (F) Wing feathers from different phenotypes, left to right: non-Almond, dark Almond, light Almond, homozygous Almond.