Question

A man with blood type B marries a woman with blood type A . Their first child has blood type 0 . Use a Punnett square to predict what other blood types are possible for their offspring .

Answer 1

The punnett square is attached to this.
The other possibilities are AB, BO, and AO. 
All of them have 25%.

Answer 2

Answer:

They have 1:4 chances of 0, 1:4 cahnces of AB, 1:4 chances of A, 1:4 chances of B

Explanation:

Blood has three types of alleles: A, B, 0 depending on the type of proteins in blood cells. They can have protein A, B, or not having them 0. The dominant allele will be B or A.

All types of blood are A, B, AB (co-dominance) and 0.

We all have two alleles for each gene, one comes from our mother, and one comes from our father.

If both parents are dominant, but they have a recessive child, you have both heterozygote genes to do the Punnett square.

Mother: I(A)i(0)

Father: I(B)i(0)