Multiple Allele Crosses

Question 1

What do they involve?

Answer 1

One gene but this gene can have more than 2 alleles.

Question 2

EXAMPLE.

In the ABO blood group system in humans what are the 3 alleles for each blood type?

Answer 2

IO is allele for blood group O.
IA is allele for blood group A.
IB is allele fot blood group B.

Question 3

EXAMPLE.

Which of the alleles are recessive/dominant/codominant?

Answer 3

IO is recessive.
IA and IB are co-dominant.
(people with genotype IAIB have blood group AB)