ABO blood grouping of humans is an example of co-dominance. Homozygotes (1^1^ and 1816) express either the A or the B
phenotype. Heterozygotes (1415) express both pheno
the result of the genotype 1940: this blood type is considered the recessive trait and I° is the recessive allele for blood type.
Consider the genetic cross for blood type of these two parents. The father is type A and the mother is type B. Both have the
recessive allele for blood type 0. Wh
offspring with type A blood?