A hypothetical family and three genes , , and shown with their alleles.

For simplicity of illustration, the chromosome of the pair with allele 0 inherited for gene (both parental and maternal) is chosen for the offsprings, so this is not to be interpreted as if allele 0 is always inherited for gene . Offsprings 1 to are identical, and similarly, offsprings to are identical. Allele is either or , and for some .

为简化演示起见，本次为子代选取了同时继承自父本与母本的、某基因（gene）带有等位基因（allele）0的染色体对，因此不应将此场景解读为该基因的等位基因0总会被遗传。子代1至某一整数均完全相同，同理，子代某一整数至另一整数亦均完全相同。等位基因（allele）的取值为某一值或另一值，且针对某一对象成立。