Question

A woman with type A blood and a man with type B blood could potentially have offspring with which of the following blood types?

Select one:

a. type A

b. type B

c. type AB

d. type O

e. all of the above

Answer 1

Question

Ans: (e) All of the above

Blood Group

Blood group is an inherited trait. There are three different genes coding for blood group namely A, B & O. Each individual receive one gene from each parent which determine their blood group.

Characterstics

• A and B are completely dominant over O.
• A and B exhibit Co-dominance.

Therefore three genes can combine in 6 different ways and give rise to 4 different types of blood groups.

Blood group / Phenotype	Genotype	Reason
Type A	AA or AO	If A combines with O only characteristics of A will be expressed as A and B are completely dominant over O. Hence phenotype or( physical expression) will be blood group Type A but will have two different genotype AA and AO
Type B	BB or BO	Same like Type A. Homozygous B or heterozygous B.
Type AB	AB	Since A&B are codominant both genes will be expressed.
Type O	OO	Genes froms both parent should be O to exhibit Type O. Homozygous O

.

In given Question Father: Type B , Mother Type A ( genotype of parents not specified)

Phenotype father B

Possible genotype of father : BB or BO

Phenotype mother A

Possible genotype of mother : AA or AO

possible combinations

1. BB X AA

	B	B
A	AB	AB
A	AB	AB

result :AB

2. BB X AO

	B	B
A	AB	AB
O	BO	BO

result AB and BO

3. BO X AA

	B	O
A	AB	AO
A	AB	AO

result AB and AO

2. BO X AO

	B	O
A	AB	AO
O	BO	OO

result AB , AO, BO, OO

Therefor parents with blood group A and B can give rise to

child with blood group Type A , Type B , Type AB and Type O.