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THE MEANING OF HEREDITY AND THE NONSENSE OF BLOOD TYPE PERSONALITY
Scientifically speaking, heredity has nothing to do with blood. It's all about genes. The age-old mistaken belief that human blood possesses some special power beyond its biological function has not faded away, even in countries with high educational standards.
“Bloodline”
The concept of “bloodline”—holy bloodline, ancestral bloodline—has no basis in reality. Heredity is about the transmission of traits from parents to offspring.
At the level of DNA, every generation gets “diluted” by a factor of one-half. You have only 50% of the DNA of each of your parents, 25% of the DNA of each of your grandparents, and so on. If you could trace your family roots back, say, 200 years (10 generations), you would find that the contribution to your genetic make-up by any of your ancestors from only 10 generations back would amount to a less than 1/10th of 1%. So much for claims about the significance of “royal bloodlines” in the world’s monarchies.
Blood Type
Millions of people in Asia believe that blood type affects human behaviour. Believers even make important life decisions based on the “psychology” of blood type, such as deciding whom to befriend, hire, or date. There is no scientific evidence whatsoever supporting the daft notion of “blood type personalities.”
In countries such as Japan and South Korea, blood type believers who consider themselves to have “acceptable” blood types abuse and discriminate against those who have “unacceptable” blood types. The irrationality and harm of such discrimination ranks with that of racism, sexism, homophobia, and xenophobia.