Blood

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Blood Types and the Population

O positive is the most common blood type. Not all ethnic groups have the same mix of these blood types. Hispanic people, for example, have a relatively high number of O’s, while Asian people have a relatively high number of B’s. The mix of the different blood types in the U.S. population is:

	Caucasians	African American	Hispanic	Asian
O+	37%	47%	53%	39%
O-	8%	4%	4%	1%
A+	33%	24%	29%	27%
A-	7%	2%	2%	0.5%
B+	9%	18%	9%	25%
B-	2%	1%	1%	0.4%
AB+	3%	4%	2%	7%
AB-	1%	0.3%	0.2%	0.1%

Some patients require a closer blood match than that provided by the ABO positive/negative blood typing. For example, sometimes if the donor and recipient are from the same ethnic background the chance of a reaction can be reduced. That’s why an African-American blood donation may be the best hope for the needs of patients with sickle cell disease, 98 percent of whom are of African-American descent.

How Is Blood Type Determined?

It’s inherited. Like eye color, blood type is passed genetically from your parents. Whether your blood group is type A, B, AB or O is based on the blood types of your mother and father.

This chart shows the potential blood types you may inherit. 

Possible blood type of child	Father	AB	AB	AB	AB	B	A	A	O	O	O
	Mother	AB	B	A	O	B	B	A	B	A	O
	O					x	x	x	x	x	x
	A	x	x	x	x		x	x		x
	B	x	x	x	x	x	x		x
	AB	x	x	x			x

Information here is from American Redcross.

Blood Type Personality

A persons blood type is predictive of his or her personality, temperament, and compatibility with others.

Type A
Best Traits	Earnest, sensible, reserved, patient, responsible
Worst Traits	Fastidious, overearnest, stubborn, tense
Type B
Best Traits	Passionate, active, doer, creative, strong
Worst Traits	irresponsible, unforgiving, "going own way"
Type AB
Best Traits	Cool, controlled, rational, sociable, adaptable
Worst Traits	Critical, indecisive, forgetful, irresponsible, "split personality"
Type O
Best Traits	Confident, self-determined, optimistic, strong-willed, intuitive
Worst Traits	Self-centered, cold, doubtful, unpredictable, "workaholic"

Information here is from wiki.