Three alleles control the inheritance of blood groups: I^A, I^B, and i.

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6.1:
Three alleles control the inheritance of blood groups: $I^A$ , $I^B$ , and $i$ .

The alleles are $\boxed{\text{3}}$ .

6.2:
The type of dominance that occurs in the inheritance of blood group B in a heterozygous woman ( $I^B i$ ) is complete dominance, where the $I^B$ allele is dominant over the $i$ allele. Additionally, the inheritance of ABO blood groups also exhibits codominance between the $I^A$ and $I^B$ alleles.

6.3:

Determine the genotypes of the parents.
Man with blood group AB: $I^A I^B$
Woman heterozygous for blood group B: $I^B i$
Determine the gametes produced by each parent.
Man: $I^A$ , $I^B$
Woman: $I^B$ , $i$
Construct a Punnett square.
$\begin{array}{|c|c|c|} \hline \text{Gametes} & I^B & i \\ \hline I^A & I^A I^B & I^A i \\ \hline I^B & I^B I^B & I^B i \\ \hline \end{array}$
List the possible genotypes and phenotypes of the children.
- Genotypes:
  
  $I^A I^B$
  
  $I^A i$
  
  $I^B I^B$
  
  $I^B i$
- Phenotypes:
  
  $I^A I^B$ : Blood group AB
  
  $I^A i$ : Blood group A
  
  $I^B I^B$ : Blood group B
  
  $I^B i$ : Blood group B
- Genotypic Ratio: $1 I^A I^B : 1 I^A i : 1 I^B I^B : 1 I^B i$
- Phenotypic Ratio: 1 Blood group AB : 1 Blood group A : 2 Blood group B
The possible genotypes and phenotypes of their children are:
$\boxed{\text{Genotypes: } I^A I^B, I^A i, I^B I^B, I^B i}$
$\boxed{\text{Phenotypes: Blood group AB, Blood group A, Blood group B}}$

Three alleles control the inheritance of blood groups: I^A, I^B, and i.

Step-by-step solution

Determine the genotypes of the parents.

Determine the gametes produced by each parent.

Construct a Punnett square.

List the possible genotypes and phenotypes of the children.

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