Final answer:
All of George and Judy's babies will have blood type B because George is homozygous (IBIB) and Judy is type O (ii), leading to a genotype of IBi in their children, which is expressed as type B blood.
Step-by-step explanation:
If George is homozygous for the type B allele (IBIB), and Judy is type O (ii), the possible blood types of their baby could only be type B or type O. Since Judy can only contribute an i allele (as she is homozygous for the recessive O allele), and George can only contribute a IB allele (as he is homozygous for the B allele), their offspring will always receive one IB allele from George and one i allele from Judy. This results in the genotype IBi for their children, which physically expresses as type B blood. Therefore, all of their babies will have blood type B.
An individual with blood type O (genotype ii) indeed can be a legitimate child of parents where one parent has blood type A and the other parent has blood type B, assuming both parents were heterozygous (IAi and IBi, respectively). This is because each parent can contribute a recessive i allele to the offspring, resulting in a genotype of ii, which is phenotypically type O blood.