allele
noun [ C ] biology specialized uk/əˈliːl/ us/əˈliːl/
等位基因，对偶基因（位于一对同源染色体的相同位置上控制某一性状的不同形态的基因）
a gene that is found in one of two or more different forms in the same position in a chromosome, and so produces a particular characteristic that can be different for different people, such as eye colour