3.

Which is a possible genotype of a child of parents with blood types O and AB? (1 point)

AO; BO

AB; BO

BO; OO
CO; AB

4.
You are looking at four tall pea plants. What are their phenotypes and genotypes, respectively? (1 point)

tall; Tt or TT

short; tt

Tt or TT; tall

tt; Short

3. One parent can only contribute an O gene, while the other can contribute either and A or B. So?

4. Phenotype is the actual physical trait, while genotype are the genes that determine the trait. So?

25 genotypes and 25 phenotypes

To determine the possible genotype of a child with parents who have blood types O and AB, we need to understand the inheritance patterns of blood types.

Blood type AB is considered the "universal recipient" because individuals with this blood type can receive blood from any blood type. Blood type O, on the other hand, is considered the "universal donor" because individuals with this blood type can donate blood to any blood type.

The ABO blood type system is determined by the presence or absence of antigens A and B on the surface of red blood cells. The genotypes for blood types A, B, AB, and O are as follows:

- Blood type A: genotype AA or AO (having either two copies of the A allele or one A allele and one O allele)
- Blood type B: genotype BB or BO (having either two copies of the B allele or one B allele and one O allele)
- Blood type AB: genotype AB (having one A allele and one B allele)
- Blood type O: genotype OO (having two copies of the O allele)

Based on this information, the possible genotypes of a child with parents who have blood types O and AB are:

- AO; BO: This combination is possible because the child can inherit one O allele from the parent with blood type O and one A allele from the parent with blood type AB. Similarly, the child can inherit one B allele from the parent with blood type AB and one O allele from the parent with blood type O.

Therefore, the correct answer is:

- AO; BO