November 7, 2008 5:13pm CST
normally, we only know 3 blood types (A, B and AB) but there is still one more..if you answer this right, i will mark you 'best response'..(you must be the first one to answer).. CLUE: it was first found in India.
• Cambridge, England
7 Nov 08
There is a very rare phenotype, apparently, called Hh which was first found in Bombay. I only just read about it when I was checking the above answer. Hh cannot receive blood from any other type but they can donate to all, as if they were type O.
7 Nov 08
The answer to your question is blood type O. Blood type O is a universal type of blood which can be donated to other people with different types of blood such as B, A, B+ and B+. Is there any A+ or A-, I am not sure about it. However, a person who has an O blood type can't accept blood from other groups of people because they can only accept blood from their own type. So I guess being an O blood type person is difficult. He or she can give blood but can't accept blood from other groups.