I need to demonstrate a cross between an individual with AB type blood and an individual with blood type A?

Heterozygous type A is Ai, type AB is AB. The Punnett square is:

_____A_____i___

A___AA____Ai__

B___AB____Bi__

So, the probability of type A is 2/4 = 0.5 and the probability of type B = 1/4 = 0.25

The genotype for the type A heterozygote is IAi. (The I is standard for blood type. It helps to show that A and B are codominant and O is recessive.)

The genotype for AB is always IAIB.

Draw a punnet square so you can see it visually. This is my attempt to create one:

* IA i

IA IAIA IAi. There are two offspring with type A blood, one with AB and one with B.

IB IAIB IBi. Therefore, there is a 25% chance of having type B.

We used the probably blocks when I was in high school, it was easier for visual learners, but I cannot seem to find them on google, so here's a calculator.