BIOLOGY

In humans, there are two dominant blood types: A and B. The recessive blood type is Type O, shown as ii. What is the probability of the offspring having type O blood?

As we see above, there are 1/4 chances that the offspring get ii genotype which is the same as 0.25 or 25%.

In humans, there are two dominant blood types: A and B. The recessive blood type is Type O, shown as ii. What is the genotype of a heterozygous type "A" blood?

IAi

In humans, there are two dominant blood types: A and B. The recessive blood type is Type O, shown as ii. What is the phenotype of IAIB?

The phenotype of IAIB is type AB blood.

In humans, there are two dominant blood types: A and B. The recessive blood type is Type O, shown as ii. Complete a cross between two heterozygous A and B blood type?

They ask us IAi x IBi. Instead of making a Punnett square, we can just mix each allele from one parent with each allele from the other parent: IAIB, IAi, IBi, ii.