The forensic doctor tells you what the Chimera phenomenon is
The Chimera is a sacred beast in Greek mythology of lion heads, sheep bodies, and snake tails, and scientists call the phenomenon that normal people carry at least four sets of DNA as chimera, which also becomes a chimera phenomenon.
Take an example to make you understand what a Chimera is
One couple gave birth to a child through IVF and the whole family was happy.
But later, he took the child to a paternity test, and it turned out that the husband was not the father of the child.
The family was in distress. First of all, the child was obtained through IVF, which ruled out the possibility of the wife cheating.
Secondly, could it be that the hospital is mistaken?! With this question in mind, the couple hired a lawyer and went to do another appraisal, and it turned out that the husband was still not the biological father of the child.
The couple was very angry and went to the hospital to ask for an explanation. As a result, the hospital responded that it was impossible to make a mistake because only the couple had done IVF that day.
So what the hell is going on?! Both husband and wife are about to collapse.
Later, a geneticist learned of this and suggested that the couple do a genetic test. By examining DNA fragments, dna family lineage can be detected
- It is the blood of the eighteenth generation of the ancestors.
As a result, by the time the test results came out, the couple was even more dumbfounded.
The biological father of this child should be the husband's younger brother!!! But the husband is an only child, and there are no brothers at all.
Going around in such a big circle, what is the truth?
This is the Chimera phenomenon mentioned at the beginning. The husband's case is that he belongs to the chimeric human formed by the fraternal twin, so he carries at least two sets of DNA.
When two eggs are fertilized at the same time, two independent embryos are formed when they develop normally, and finally they develop into a pair of fraternal twins.
Simply put, during this husband's embryonic period, there was once a twin brother
。 But that embryo was too weak and was later absorbed by the powerful embryo. And the weaker embryo becomes a part of the stronger embryo, such as an organ.
This phenomenon is actually more common in medicine, many people in the early stage of pregnancy, the B ultrasound examination result is twins, but later found that the twins became singles, in fact, there is an embryo that is absorbed by another with stronger vitality, which is actually the Chimera phenomenon.
From the above content to self-knowledge (DAN identification of Wang Forensic Doctor)