Contents:
- Medical Video: 5 People With Unique Skin Colors
- Kinds of twins
- 1. Siamese twins
- 2. Twins superfetation
- 3. Different father's twins (superfecundation)
- 4. Identical twins of different sexes
- 5. Twin mirror
- 6. Parasitic twins
- 7. Twins of different races
Medical Video: 5 People With Unique Skin Colors
As long as this is of course you only know identical twins and twin sexes. However, do you know there are various other types of twins on this earth? Let's see, what kinds of twins are unique in this world.
Kinds of twins
1. Siamese twins
Conjoined twins is a condition when monozygotic (the result of fertilization of sperm and egg cells) that is not completely separate. Separating the cells which are divided into two occurs because the ovum cells do not completely divide themselves.
Later, conjoined twins have one part of the body that is connected to each other, whether it's body tissue, organs or even other limbs.
2. Twins superfetation
The kinds of twins are fairly rare, and can also be said to be not twins. How come? Yes, twins superfetation occurs when a pregnant mother ovulates or releases eggs. When at the time of ovulation the mother and partner have intercourse and sperm cells are released, fertilization can occur more than once.
Therefore, later the mother will have more than one fetus produced from different sperm and egg cells. Because of the different fertilization processes, there is an age range between these organs. The age of the fetus can be different days or weeks according to the time of conception, and can also be born at the same time.
3. Different father's twins (superfecundation)
Different father twins are dizygotic twin conditions (two different sperm cells and two eggs) from the results of hyperovulation. This happens when there is more than one egg cell released by a woman's body.
The first egg is fertilized by the first man, and after a few days or time later the second egg is fertilized by a different man again. These twins are also commonly referred to as superfecundation twins. Later physical conditions (hair, skin, eye color) in both babies born can be different because of different sperm.
4. Identical twins of different sexes
Identical twins that occur from the result of fertilizing one sperm and one egg cell. Generally these twins have the same sex. This is because they are formed from the same fetus that contains male sex chromosomes (XY) or women (XX).
But in the case of these different sex twins, there are several cases of genetic mutations that make the twin male fetuses lose one of the Y chromosomes and develop.
Later the fetus that loses the Y chromosome will develop into a female fetus. The risk is that twin girls born can have Turner syndrome, with short stature and lack of ovarian development.
5. Twin mirror
The other types of twins are mirror twins. This occurs when one sperm cell and an egg cell successfully fertilize and divide in two. In the case of mirror twins, the cleavage process can occur very slowly (can be more than 1 week). In addition, during the slow division process, the twin fetuses can develop and grow asymmetrically upside down, just like you mirror.
Later after birth, maybe one child is left-handed and one uses the right hand. There are also children who may have birthmarks on the opposite side of the body. In theory if the twins face each other, they will appear as mirror reflections.
6. Parasitic twins
Parasitic twins are twin types of conjoined twins whose one twin does not develop normally. Then, the twin that does not develop normally stops growing and the inside is still attached to the twin. Named parasitic twins because these non-developing twins usually take blood from their perfect twin.
7. Twins of different races
This condition occurs in fertilization that occurs in two different egg cells, where twins can be born with different physical characteristics according to race.
In 2005, racial couples in England gave birth to two female twins with physical characteristics the first child had blond and light-skinned hair, and the other had dark hair and skin according to their different parent races.
Apart from through natural fertilization (getting pregnant from having sex), these types of twins of different races can also occur through IVF procedures (In Vitro Fertilization).
