The number of phenotypes and genotypes of blood groups in human beings are
4 phenotypes and 6 genotypes
Blood group in human beings have four phenotypes namely A, B, AB and O. Blood group A has two genotypes (IAIA,IAi), blood group B has two genotypes (IBIB,IBi) and blood group AB (IAIB) and O (i i) have one genotype each. Thus adding upto 6 genotypes.