Is it possible that the twins are not a father? When you hear this topic, everyone must be very puzzling, "The world is crazy", "How can twins not be the same father"? But don't be surprised, this is indeed scientifically based! And it's really happened in the United States!
Half-siblings
In 2015, in a court in New Jersey, the United States, a case about raising a child caused quite a stir, and after DNA testing, it was found that the twins born to the mother in the case were half-siblings, that is, the fathers of the two children were not the same person.
It is reported that the woman admitted that she had sex with two men during the same menstrual cycle, resulting in the fertilization of the two eggs separately.
Coincidentally, in 1982, a woman gave birth to twins whose skin tones were very different colors, one black and the other white, which exploded, but the child's father did not pursue it, because the mother was violated by a rapist on the tenth day of menstruation.
He then had sex with her husband, which led to the birth of a black baby boy with blood type A and a white baby boy with blood type O. Logically, even if you have sex with different people, but the egg is just one, how can you produce a twin with completely different skin color and blood type?
Identical twins and fraternal twins
The twins in our impression, their appearance is generally exactly the same, but there are also many twins whose appearance is also very different, which is the difference between identical and fraternal twins: twins born of the same egg are identical twins, to put it in layman's terms, they are all developed from the same seed, and the appearance is naturally almost exactly the same.
The fraternal twins are developed from two eggs, that is, two seeds, so the twins do not look like each other.
And fraternal twins also have two situations, one is called heterogeneous re-pregnancy, one is called simultaneous re-pregnancy, the phenomenon we mentioned above is called simultaneous re-pregnancy, the same period of re-pregnancy to achieve the requirements are extremely high, generally speaking, women will only release one egg each time, only when women shoot two eggs at the same time, it is possible to achieve simultaneous re-pregnancy.
Not only are there requirements for eggs, but there are also certain requirements for men, which must be exercised twice in a short period of time, and in this process, sperm must maintain a certain activity in the fallopian tubes, so that two eggs can be fertilized at the same time to produce the twin phenomenon we mentioned above, but the situation of two fathers is too bloody and rare. Therefore, the probability of this kind of re-pregnancy at the same time is extremely small, and there are only 19 reported cases in the world.
The picture shows the process of re-pregnancy
Different skin tones may also be the same father
Hearing this phenomenon above, you may fall into a mess in an instant, but I tell you that there are more messy things, even if they look different, it may be a father. There is a couple in the United Kingdom who successfully gave birth to a pair of twins in white and black, but after genetic identification, the two twins are indeed the birth of these two couples, but why do they look different?
This is most likely because the two embryos show different appearances when they develop, and the child's genetic genes are provided by both parents, and the parents always provide differently, for example, your face looks like your father, your lips look like your mother, and those revealed characteristics are the apparent inheritance of genes. The skin color of these twins is white and black, because it is a white baby, he did not show the black gene derived from the father, but chose to show the mother's white, and the black baby is the same.
The same egg gives birth to a dragon and phoenix fetus
Most of the sons and daughters of the dragon and phoenix fetus are fraternal twins. We all know that fraternal twins are two sperm and two eggs combined to produce two fertilized eggs, so that both fertilized eggs have complete gene expression and complete trait expression, so they will give birth to healthy dragon and phoenix fetuses.
But if the dragon and phoenix fetus born from the same fertilized egg, things are not good. In fact, the above information we did not make clear, in addition to identical twins and fraternal twins, there is a special twin called semi-identical twin, it is two sperm and an egg combined, this situation is very rare, it will produce three sets of chromosomes, and these three sets of chromosomes will not be evenly distributed in three different cells, it will lead to one of the cells It only has two sperm chromosomes, and the cell must have both parent chromosomes to survive.
The third cell dies after the pairing fails, while the death of the third cell causes the fertilized egg to encounter a bug as it continues to develop, causing it to terminate and miscarry. With the remaining two cells, they won't have any good results, and there are two recorded cases of semi-identical twins worldwide.
One of them occurred in Australia, this twin was born, he suffered from severe blood clots, at 4 weeks he needed to undergo amputation of the right arm, he was later tested for hypogonadism, it can be said that his fate is very tragic, genetic defects doomed him to develop imperfectly from an early age.
Pregnant twice, but not twins
Generally speaking, twins win in one sport, but I would say that if they are conceived twice in a short period of time, are they twins? I believe that everyone will also be very confused, the brothers spent 10 months together in the stomach, saying that they are not twins, it seems a bit excessive, but this phenomenon really happens to humans.
A couple in the United States was pregnant twice in five days, the Odalys couple from the United States experienced the failure of the last miscarriage, and got pregnant again, they learned the news through the test strips, rushed to the hospital non-stop, eager to confirm the news, after the doctor's examination found that Odalys did have two babies in her belly, she was very happy, did not expect to be able to conceive twins after the miscarriage.
However, the doctor told him that the two children were not conceived at the same time, they were separated by 5 days, and they were not twins. At that time, the doctor speculated that this was most likely caused by the activity of the sperm, and that Odalys had laid two eggs by chance in that month.
After the first conception, her husband's sperm remained active in the fallopian tubes, and in general, the activity of sperm can be maintained for about 5 days, which coincides with the time of the Odalys couple's second pregnancy, and in such a fortuitous situation, she successfully conceived a second time and gave birth to a pair of babies.
This is the wonder of the human body, you think it is actually it is not, you think it is not, in fact, he it, the knowledge about pregnancy and heredity still needs us to study more deeply, I believe that through our research, the day when the future twins can control, it is not far from us.