Is "blood type determines sex" false?

In fact, the statement that "blood type determines personality" has not been recognized in academic circles. Even those studies that report a significant correlation between blood type and personality have ambiguous or even contradictory results.

Japanese Takeji Furukawa first put forward the relationship between blood type and personality. In 1927, he proposed that "people have different temperaments due to different blood types; The same blood type, the same temperament ". At that time, he assumed that the main purpose was to serve Japanese rule of Taiwan Province Province. At that time, the proportion of O-blood in Taiwan Province Province was as high as 40%, so he explained why people in Taiwan Province Province constantly resisted the Japanese colonial regime by saying that people with O-blood were "bold, aggressive, like directing others, confident, strong-willed, aggressive and aggressive", and suggested to the authorities to promote consanguineous marriage between people in Taiwan Province Province to reduce the proportion of O-blood in Taiwan Province Province.

This actually comes from people's psychological effect-Barnum effect (originally a general description applicable to anyone, but people will think that it describes themselves). For example, if you show a person with blood type O a description of blood type B, he will agree. Barnum effect exists widely, not only describing personality with blood, but also various constellation theories and fortune telling.

The formation of personality is influenced by many factors, including congenital factors, family growth environment, work, personal experience and so on. Even the fifth-grade test results of identical twins with the same genes are only about 50% similar in five different personality characteristics.

Based on this, it is speculated that genetic factors have only about 50% influence on personality, and the other half may depend on acquired factors. Genetic factors alone are also complicated. Blood group gene is only one of tens of thousands of genes in human beings, and its influence on personality is limited.