How many alleles are there for the main blood types found in the human population?
two alleles
three alleles
four alleles

Three Alleles

Explanation:

There are three alleles for human blood type: A, B, and O.

These three alleles create the four main types of human blood: A, B, AB, and O.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

answer; 4 electrons;