Contents:
- Medical Video: Identical Twins Learn Weird Twin Facts
- 1. Grow from different eggs and sperm
- 2. Derived from a different zygote
- 3. The sex can be different
- 4. Have a different physical and nature
- 5. The opportunity to have fraternal twins is genetic
- 6. Has 2 different placenta
- 7. Can be formed at different times
Medical Video: Identical Twins Learn Weird Twin Facts
Twins don't have to have faces that are always similar. Fraternal twins are twins that do not look visible to the twins. Even the twin can be of different sexes, one female, and male twin. Already know the facts about twins are not identical?
1. Grow from different eggs and sperm
These non-identical fraternal or twin twins are different from identical twins. If identical twins come from the same egg and sperm (called monozygotic). While fraternal twins come from different egg cells, and different sperm, this is called dizygotic conditions.
Generally, once ovulation, a woman secretes one egg, whether it's from the left or right ovary. However, in pregnant women who have fraternal twins, the eggs released are not one but several.
As a result, when sperm enters, different sperm swim into one of these egg cells. Each egg cell finally fertilizes close together.
2. Derived from a different zygote
Because fraternal twins occur on different eggs and sperm, they grow and develop from different zygotes. Mothers who have twins will contain 2 zygote cells in their womb.
A zygote is a cell that results from the union of sperm and ovum which is the embryo of the fetus in the womb. Because of the different zygotes, twins are not identical and have different physical conditions.
3. The sex can be different
Because twins are not identical from different eggs and sperm, it is very possible if the gender is different. Fraternal twins can be the same as women, both men and women and men.
What determines this man or woman is influenced by the chromosomes carried by sperm. Sperm can carry X or Y chromosomes, while women carry only one type, X.
In the case of fraternal twins, when one egg is fertilized by a sperm carrying the Y chromosome, a male child will be formed. Whereas if the sperm fertilizes the other egg by carrying the X chromosome it will form a daughter.
Therefore, fraternal twins can have different sexes, unlike identical twins.
4. Have a different physical and nature
Like older siblings in general, non-identical twins also have forms and characteristics that can be very different.
From eye color, hair shape, height, to its nature can also be very different. Because, they have different DNA unlike identical twins who have exactly the same DNA.
These twins are not identical like the younger siblings in general who are different years of birth. Physical isn't always the same right?
Well, just like fraternal twins, the difference is that the two fraternal twins grow and develop in the same time not in different years, like the younger siblings, generally different birth years
5. The opportunity to have fraternal twins is genetic
Fraternal pregnancy occurs because there are two fertilized eggs at once. Because, some women do have some eggs released in one cycle, this condition is called hyperovulation. Women who often experience hyperovulation have the potential to experience non-identical twins' pregnancies.
The nature of hyperovulation is genetic or decreases. Women who have genes that cause hyperovulation can reduce this trait in their daughters to experience fraternal twin pregnancies again.
6. Has 2 different placenta
In contrast to identical twins in general, twins are not identical living in the mother's womb with their respective placenta, this is called dichorionic.
The placenta is an organ that functions to deliver oxygen and nutrients essential for growth and development in the womb. This organ also becomes a barrier so that germs or foreign substances from the mother enter the baby's body.
Because fraternal twins have different placenta, this pregnancy is not susceptible to the risks that often occur in identical twins. For example, the fetus competes with each other for food and finally the supply of nutrients is not evenly distributed until the possibility of an easily tangled umbilical cord that can disrupt fetal development.
7. Can be formed at different times
Usually during ovulation only one egg is released, but this is not in the case of fraternal twins. Therefore, sometimes zygotes can form at different times, there is a time interval.
For example, one egg is fertilized by sperm after sexual intercourse today, and the other egg is fertilized during the next sexual relationship. As a result, fraternal twins can have a different age in the womb for a few days. This phenomenon is known as superfetation.
