How Will People with the Same Blood Type Be Related

Question

How will people with the same blood type be related?
A) They are always unrelated.
B) They are always related.
C) They may or may not be related.
D) They always have both alleles in common but are not necessarily related.

Accepted Answer

Blood type is inherited from parents, but people with the same blood type may still be unrelated if they have different sets of ancestors. Therefore, they may or may not be related.