Many pregnant women want to conceive twins, preferably twins, so that they can have children. However, the incidence of this situation is very low, and in the case of natural conception, the incidence of twins is very low. Many friends believe that twins are fraternal twins, but there are also cases of identical twins. So, what is the formation principle of identical twins?
1. Dragon Phoenix Fetus
Longfeng twins are twins of different genders, known as dizygotic twins. Only in such cases can there be a possibility of having a twin, with a 50% chance of becoming a twin; The characteristic of monozygotic twins is that the blood circulation of both fetuses is interconnected through the placenta.
Therefore, monozygotic twins have identical blood types and genders, and their appearance is also difficult to distinguish. Having twins is related to genetics, race, medication, and other factors. The country with the highest probability of having twins in the world is 15%, while the probability in China is around 5%, and the probability of having twins is much smaller.
2. Formation principle
Twins are identical twins, while twins are fraternal twins. In very rare cases, identical twins may have one male and one female, but both men and women usually have chromosomal or genetic abnormalities. From 1961 to 2000, medical literature has reported at least four cases of identical twins of different genders. The so-called monozygotic twins refer to the situation where a fertilized egg divides into two embryos during fertilization, with the same sex and genes, and the probability is extremely low.
3. Family inheritance
Twin pregnancies have a familial genetic tendency and are inherited from the mother's line. Studies have shown that if a pregnant woman is one of the twins, her chances of having twins are 1 in 58; If a pregnant woman's father or mother has twins, her chances of having twins are also high. Another study reported that 4% of mothers with twins are twins, while only 1.7% of fathers with twins are twins. In the early stages of pregnancy, it is easy to detect twin pregnancy through ultrasound examination. The discomfort and reactions in twin pregnancies are often more pronounced than in singleton pregnancies.
What is the formation principle of identical twins? The incidence of identical twins in the world is extremely low, indicating that the occurrence rate of this situation is pitifully low. The main reason for the occurrence of identical twins is due to chromosomal or genetic abnormalities. Therefore, under normal circumstances, both twins require two eggs to be fertilized simultaneously.
