Three alleles determine the ABO blood types of humans I A produces the A phenoty

Question

Three alleles determine the ABO blood types of humans IA produces the A phenotype, IB produces the B phenotype and i
produces the O phenotype. The effects of IA and IB are dominant to i but are codominant with each other.

Parental Phenotypes

Parental Genotypes

Phenotypes of Offspring

A

B

AB

O

B x B

3/4

1/4

B x A

1/2

1/2

B x A

1/4

1/4

1/4

1/4

B x AB

1/4

1/2

1/4

B x O

1

B x O

1/2

1/2

Parental Phenotypes

Parental Genotypes

Phenotypes of Offspring

A

B

AB

O

B x B

3/4

1/4

B x A

1/2

1/2

B x A

1/4

1/4

1/4

1/4

B x AB

1/4

1/2

1/4

B x O

1

B x O

1/2

1/2

Explanation / Answer

1.) IBi x IBi

2.) IBIB   x   IAi

3.) IBi x   IAi

4.) IBi x   IBIA

5.) IBIB x ii

6.) IBi x ii

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