What are the advantages and disadvantages of hybrids?

The advantage of hybrids is that they are generally beautiful, but the disadvantage is that there may be more disease genes in the genes.

Because of racial differences, mixed-race children can combine the characteristics of different races and tend to be beautiful, which is an advantage that most people expect but can't get.

From a biological point of view, first of all, there are too many dominant genes in hybrids. These dominant genes include not only excellent genes, but also disease genes, so the dominant probability of diseases is much higher than that of pure breeds.

Secondly, because both paternal disease genes and maternal disease genes are inherited, there will be more disease genes compared with purebred ones, but most of them are recessive, but they are real. The first generation of hybrids does not show up, but the second generation and the third generation will show up.

Extended data:

Looking back at history, modern Eurasian is a hybrid of human beings and their distant relatives Neanderthals. There are 1.5% to 4% Neanderthal genes in modern Eurasian genes (which have little effect on brain and testis), and the hybridization between the two species may only occur four times, and some diseases are closely related to Neanderthal genes.

The emergence of modern hybrids is related to geographical discoveries. 1500 On April 22nd, the Portuguese colonist Cabral and his party landed in Brazil, visited the coastal areas for nine days, and then left Brazil with two death row inmates. These two death row prisoners combined with the local Indians to form the earliest hybrid.