In typical Mendelian Inheritance 2 alleles determine phenotype. In this case there are > 2 alleles for a trait in a population. Multiallelic inheritance produces a range in phenotypes. In Plants, the varigation patterns on clover leaves “Chevron” is determined by a gene with multiple alleles. In humans, there are four blood groups A, B, AB and O. These groups are derived from 3 alleles: the A, B and O allele.