BO type blood

When I was able to examine a drop of blood under the microscope, I remembered that there were different blood types and that this in particular was a type BO. What that means is that while the genotype of the person has B and O types, B is the phenotype shown because it is dominant over O. 

BO type blood

As seen in this picture, the blood cells are all surrounded by plasma that take up nearly 55% of the blood volume while the cells only make up about 45%. The BO blood type is distinguished by the other blood types by their presence of antigens- substances known to create out antibodies.

BO type blood 400X
The reason why you cannot mix blood types together such as the BO type shown here with an A type is because the antibodies will begin attacking the foreign blood type, causing clumps and other side effects to occur that may lead to death.