How to tell whether a person is a hybrid or not, and what aspects to look at?

Human hybrids refer to descendants of different races. The first generation is semi-mixed, the second generation is quarter-mixed, and so on. Racial characteristics gradually return to one of the races, so although there are many hybrids in the world, it is difficult to form a new race. Hybrid children can be divided into dominant inheritance and recessive inheritance. Dominant inheritance: the characteristics of the two races can be clearly seen from the appearance, and recessive inheritance: the appearance only shows the characteristics of one race, and the characteristics of other hybrids are only reflected in other physical and physiological indicators. This kind of hybridization can not be seen at a glance, and the most accurate judgment is genetic determination. Especially in the hybrid offspring after many generations, the dominant characteristics gradually disappear and only exist in genetic markers.