Identical twins are closely related to facial resemblance. However, not all pairs of twins always have the same face. This condition is called non-identical twins. now What causes identical and non-identical twins? Check out the answer in the following article.
Identical or non-identical twins are determined by the number of eggs fertilized by sperm cells and the growth process in the mother's womb. Identical twins are formed from the division of one egg, while non-identical twins are formed from two eggs.
About Identical Twins and Non-Identical Twins
To find out more about identical twins and non-identical twins, here is the explanation:
Twin identical
Identical twins occur when one sperm cell fertilizes one egg. One fertilized egg cell then divides into two and produces the same gene or DNA.
Therefore, pairs of identical twins always have the same sex, whether it is a girl or a boy. The faces of identical twins look very similar and they usually share the same placenta in the womb.
Twin not identical (fraternal twins)
Cases of non-identical twins are more common than identical twins. Non-identical twins occur when two eggs are fertilized by two sperm cells.
Fraternal twins do not share the same genes, so they are born with different sexes (girls and boys) and different faces. In the womb, non-identical twins also have their own placentas.
Factor Psupport Awant Kembar
About 1 in 250 women have a chance of having twins. There are several factors that can make you pregnant with twins, including:
1. Age of pregnant women
Pregnant women aged 35-40 years have higher levels of the hormone estrogen than younger women. This allows the ovaries to produce more than one egg during ovulation.
If two eggs are fertilized, the chances of conceiving non-identical twins are even higher.
2. Descendants
Pregnant women who have fraternal twins or a family history of fraternal twins are more likely to have non-identical twins.
Meanwhile, identical twins are not passed down in the family. In fact, until now, experts still do not know for sure how identical twins can occur.
3. Number of previous pregnancies
Some research shows that women who have been pregnant before are more likely to have twins. However, this still requires further research to find a correlation between the number of previous pregnancies and the birth of twins.
4. Reproductive technology assistance
IVF or in vitro fertilization (IVF) procedures are part of assisted reproductive technology (TRB). This procedure is performed by injecting one or more embryos into the uterus, thereby increasing the chances of conceiving twins.
5. Body shape of pregnant women
Non-identical twins are more commonly experienced by pregnant women who have a large body posture than those who are small. So far, there is no clear link between the height of pregnant women and the chance of conceiving twins. However, the nutritional intake of pregnant women is thought to increase the chances of multiple pregnancies.
The risk of conceiving twins, either identical twins or non-identical twins, will certainly be greater. Therefore, if you want to have twins or are pregnant with twins, consult and check the condition of your pregnancy regularly to the obstetrician.