In a paternity test, investigators first analysed the blood groups before they conducted DNA profiling. A paternity test was done for THREE males. The results from the blood group analysis and DNA profiling are shown below.

Here are the answers to the questions based on the provided information:

QUESTION 3

3.1.1 Name ALL the possible genotypes for male 3.
Male 3 has blood group A. The possible genotypes for blood group A are:

• $I^A I^A$
• $I^A i$

3.1.2 Explain why the investigators excluded male 2 in the DNA profiling.
The child has blood group AB, meaning the child inherited an $I^A$ allele from one parent and an $I^B$ allele from the other. The mother has blood group AB, so she can contribute either $I^A$ or $I^B$. Male 2 has blood group O, which means his genotype is