We often wonder what the twins are different from twins, when we see like brother and sister. Why one we call the twins and the other twins? What is really the difference and characteristics of these same people?
Among scholars there is no such thing as “twins”. Only use the scientific term “twins”. If you look in a school biology textbook, remember that the future baby is growing in a fertilized egg. There are identical (monozygotic) and fraternal (dz, trishatny, etc.) embryos.
The main difference in conception.
The twins differ from fraternal twins in the first place? A special process of conception. The essence is that different cells are fertilized by separate sperm. Gynecologists call this a multiple pregnancy. When the egg divides into several cells, often two, identical twins are conceived. The development of the fruit proceeds separate ways, although the conception was due to one sperm. And twins is called fraternal twins in an unscientific environment. They develop from different fertilized eggs. Simply put, separate the male cells fertilize two different female cells almost simultaneously.
As a rule, twins of the same sex and twins — no. That is born at the same time, twins a boy and a girl was named Royal twins. Also twins have identical incision and eye color, skin tone, hair texture. Twins often overlap with the traits of each other, but can be no more than brother and sister, who were born with a small time difference.
In genetic terms the differences and the similarities much more. Identical germ the same set of genes, blood group and RH factor. Even the fingerprints together. If they ever have to do an organ transplant, the operation likely will be successful. For fraternal such changes are incompatible, because in a biological sense they are quite different.
What are the chances of multiple births
This is usually the chance. Genetics still are unable to reliably determine what should be the order of genes for their conception. It is believed that most of this happens through the maternal line and is passed from grandmother to granddaughter. However, scientists have come to some proven facts on which the probability of having twins increases.
- Age. The older a woman is, the more multiple pregnancies. For example, in France the peak of the birth of fraternal twins account for 35-40 years mother. Some gynecologists believe that this is why the birth of a child at the age of 36 and later, can become dangerous because the uterus can not bear this load in the image of the two embryos.
Contraception. When excessive hormonal contraception, the probability of conceiving twins increases. All because of the hormone gonadotropin. He is responsible for stimulation of the maturation of female germ cells. During the period of omulyovaya ovary may issue and fertilize two or three eggs, and why are born twins or triplets.
- The treatment of infertility. In the case when a woman begins treatment for infertility and is constantly under the relevant drugs that stimulate the ovaries in the strong pace.
- ECO. During in vitro (artificial) fertilization the probability of having fraternal twins increases.
Identical twins are born in about 1 in every 3-4 thousand births. With a frequency of 1 birth in 90 beget twins. But lately, the statistics is increased, and the latter occur on the light more often.Is it possible for ultrasound to detect the difference of twins from the twins?
Yes, you can. But only if the egg split before implementation. Otherwise, the picture during the test will look as if the female is carrying twins and will give birth to twins.
Not always a difference can be seen in the structure of the fetus during pregnancy. The difference can be fixed if the embryos of different sexes. However, even here it is impossible to be completely sure, because after birth it becomes clear that twins were born, although an ultrasound determined the twins on the floor of the embryos.
It is different than the upbringing of twins and twins
After conception and birth, the kids have a difficult way to grow up and grow up. Given that such children are special, and that education should be relevant, as many parents. However, it is not so.
Often differs from twins of twins significantly in terms of education. They have almost no similarities to the character, talents, or other inclinations. For one simple reason — every child is nourished and develops in their environment, and even the twins, is similar for all genetic and biological parameters can be quite different in character, temperament and taste preferences. The twins, on the contrary, can have the same looks and the same to be brought up, but will not have biological similarities.
In 1922, in the United States conducted an experiment. Two girls-identical twins Jesse and Besi was sent to be raised in different families two weeks after birth. As we remember, identical twins have the same set of genes. Only in this case they had different living conditions. The first time they met at 18, and found that they have similar level of intelligence, vigor, they both had tuberculosis. But the girls had different taste preferences, views on life, opinions about issues and life aspirations.
So, the main differences from twins of twins:
- different process of conception and fetal development: identical embryos develop within the egg and are considered twins, fraternal — different eggs and are considered twins;
- the twins always the same sex and twins in the advantage of cases of different sexes;
- the twins, though similar to each other, but are completely different biologically, and the twins have similar appearance and genetic set.
Here’s an interesting process of birth and development. Therefore, stay attentive to your own health and remember that you’re twins and twins are first and foremost children!
The twins differ from fraternal twins, conception and upbringing