AP BIOLOGY

Detailed explanation-1: -In order for a person to have type A blood, their genotype must be either AA or AO. A person must have inherited an A allele from at least one parent. They cannot have inherited a B allele from either parent.

Detailed explanation-2: -If someone has blood type A, they must have at least one copy of the A allele, but they could have two copies. Their genotype is either AA or AO. Similarly, someone who is blood type B could have a genotype of either BB or BO. A blood test of either type AB or type O is more informative.

Detailed explanation-3: -If you have an AA or AO genotype, you will have the phenotype of type A blood; if you have a BB or BO genotype, you will have a type B blood phenotype; if you have an AB genotype, you will have a type AB blood phenotype; and if you have an OO genotype, you will have a type O blood phenotype.

Detailed explanation-4: -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.