Genetics Part 3

In man, normal body pigmentation is determined by gene A whose recessive allele a brings about albinism (lacking of body pigments). The pedigree below shows the inheritance of albinism in a family.

The genotype of individual 1 is

• AA.

• Aa.

• aa.

The genotype of individual 2 is

• AA.

• Aa.

• aa.

The genotype of individual 4 is

• AA.

• Aa.

• aa.

If individuals 2 and 3 were to have another child, what is the chance of this child being an albino?

• 25%

• 50%

• 67%

• 75%

The pedigree below shows the inheritance of blood groups in a family.

If I^A represents the allele for blood group A and i represents the allele for blood group O, what is/are the probable genotype(s) of individual 1?

• I^AI^A only.

• I^Ai only.

• I^AI^A or I^Ai.

The pedigree below shows the inheritance of blood groups in a family.

If I^A represents the allele for blood group A and i represents the allele for blood group O, what is/are the probable genotype(s) of individual 2?

• I^AI^A only.

• I^Ai only.

• I^AI^A or I^Ai.