Although the paternal Y chromosome of Hakkas has relatively pure genes of Central Plains Han nationality, their maternal X chromosome is basically from Miao and Yao nationality, which is very similar to the maternal line of She nationality now. This is the result of Hakka men's long-term adoption of local indigenous women, which shows that in addition to genetically carrying the characteristics of Han nationality, they have been integrated into the local ethnic groups in blood and biology.

For example, a Han male 1 married a local female 1, and their son, although completely carrying his father's genes, is only half of Han descent. Suppose this son takes another local woman, and their son also carries the gene of Han male 1, but only 1/4 of Han descent. If the grandson of male 1 is tested for DNA, it can be said that the grandson is "pure Han", but it is not physically the case. By analogy, so many generations, today, how many Han ethnic groups are left in Hakka? Therefore, it cannot be said that Hakkas are pure Han people.

The so-called Y chromosome is only passed from father to son, and as long as the paternal side guarantees that it will be passed down from generation to generation, the Y chromosome will always be pure. No matter how much blood of other ethnic groups is mixed in. I think it is not enough to pay attention to the Y chromosome in the current genetic research. The Y chromosome can only show who the paternal ancestors of a nation are, while the X chromosome can reflect the overall lineage composition of this ethnic group because it is carried by women.