Co-dominance and Multiple Alleles

Question 1

Definition of codominance

Answer 1

• a form of inheritance where both alleles in a heterozygous individual express themselves in the organism
• with neither dominant or recessive, and both contributing to the phenotype

Question 2

What are codominant alleles?

Answer 2

Two alleles which both expresses themselves in the heterozygous condition

Question 3

What are multiple alleles?

Answer 3

A form of inheritance where there are more than two alleles / alternative forms of a gene controlling one characteristic

Question 4

The three alleles for ABO blood group

Answer 4

1. I^A
2. I^B
3. I^O

Question 5

Which alleles are dominant and which alleles are recessive

Answer 5

I^A and I^B are codominant

I^A and I^B are dominant over I^O

I^O is the recessive allele

Question 6

Genotype of blood group A(phenotype)

Answer 6

I^A I^A , I^A I^O

Question 7

Genotype of blood group B(phenotype)

Answer 7

I^B I^B , I^B I^O

Question 8

Genotype of blood group AB(phenotype)

Answer 8

I^A I^B

Question 9

Genotype of blood group O(phenotype)

Answer 9

I^O I^O