Step-by-step explanation:
To create a Punnett square, we need to write the genotypes of the parents and then use them to determine the possible genotypes and phenotypes of their offspring.
Let's use "A" to represent the allele for blood type A, "B" for the allele for blood type B, and "O" for the allele for blood type O.
The genotype of the first person who is heterozygous A and positive can be represented as: Aa Rh+.
The genotype of the second person who is AB- can be represented as: AB Rh-.
We can now create a Punnett square by combining the gametes of each parent to determine the possible genotypes and phenotypes of their offspring.
| A a
---|---------
A | AA Aa
B | AB Ab
O | AO Ao
The Punnett square shows that the possible genotypes of the offspring are AA, AB, Aa, Ab, AO, and Ao.
The possible blood types of the offspring can be determined by using the ABO blood type system. The genotypes AA and AO both result in blood type A, while the genotype AB results in blood type AB. The genotypes Aa and Ab both result in blood type A as well. Therefore, the possible blood types of the offspring are A and AB.
The Rh factor is determined by a separate gene and follows a different inheritance pattern, which is beyond the scope of this Punnett square.