- 1 main difference: in the conception!
- 2 What is the probability of twin births
- 3 Can you find on ultrasound contrast twins of twins?
- 4 The different training twins and twins
- 5 Conclusion
Among scientists there is no concept of "twins".Use only the scientific term "twins."If you look in the school textbook of biology, remember that the future baby develops in the fertilized egg.There are identical (monozygotic) and fraternal (dizygotic, trizigotnye etc.) embryos.
main difference: in the conception!
The twins are different from fraternal twins in the first place?A particular conception process.The point is that different cells are fertilized by separate sperm.Gynecologists call it a multiple pregnancy.When the egg is divided into several cells, most often two, identical twins are conceived.Fetal development takes place through separate, although conception was due to one sperm.A twin - the name of fraternal twins in the non-scientific environment.They develop in different fertilized eggs.Simply put, some male cells fertilize two different female cells almost simultaneously.
As a rule, same-sex twins, and twins - no.This boy and girl twins born at the same time were called royal twins.Also, identical twins incision and eye color, skin tone, hair texture.Twins often duplicate each other's features, but may not be more similar than siblings who were born with a small time difference.
In terms of genetic differences and similarities are much greater.At identical embryos the same set of genes, blood group and Rh factor.Even fingerprints converge.If they ever have to do an organ transplant, the operation is likely to be successful.For fraternal such substitutions are incompatible, because in a biological sense, they are quite different.
What is the likelihood of multiple births
Usually it is the will of the case.Genetics still can not reliably determine what should be the order of the genes for their conception.It is believed that this happens more often on the maternal side and is passed from grandmother to granddaughter.However, scientists have come to some proven facts on which the probability of the birth of twins increases.
- Age .The older a woman is, the more cases of multiple pregnancies.For example, in France the peak of fraternal twin births accounted for 35-40 years mother.Some gynecologists believe that this is why the birth of a child 36 years of age and later can be dangerous, because the uterus can not bear such a burden in the form of two embryos.
- Contraception .Excessive use of hormonal contraception increases the likelihood of conceiving twins.All because of the hormone gonadotropin.He is responsible for the stimulation of the maturation of female gametes.During the ovulating ovary may issue and fertilize two or three eggs and why born twins or triplets.
- Infertility treatment .In that case, when a woman begins to infertility treatment and is constantly under the relevant drugs that stimulate the ovaries work in a heightened pace.
- IVF .During in vitro (artificial) fertilization probability of the birth of fraternal twins increases.
it possible to detect an ultrasound contrast twins of twins?
Yes, you can.But only if the egg is split in two before implementation.Otherwise, the picture at the time of the survey will look as if a woman bears twins, and twins are born.
not always the difference can be seen by 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 giving birth, it is clear: the twins were born, although twins ultrasound determined the sex of embryos.
The twins different education and twins
After conception and birth of babies to be a difficult path - to grow and mature.Taking into account that such children are special, and that education must be relevant, as many parents think.However, this is not quite true.
Frequent unlike twins of twins considerably in terms of education.They have almost no resemblance to the nature, talents or other dispositions.For one simple reason - every child is brought up and developed in their environment, and even the twins are similar in all of the genetic and biological parameters may be quite different in character, temperament and taste preferences.Twins on the contrary, may have the same views and the same 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 given to education in the different families two weeks after birth.As we remember, in identical twins the same set of genes.Only in this case we had different life conditions.The first time they met in 18 years, and found that they have a similar level of intelligence, vigor, they were both ill with tuberculosis.But the girls have different taste preferences, views on life, views on the problematic issues and life aspirations.
So, the main differences between the twins of twins:
- different process of conception and fetal development: identical embryos develop in one egg and considered twins, fraternal - in different oocytes and are considered twins;
- twins always unisexual, and the double advantage in cases of different sexes;
- twins, though similar to each other, but very different biologically, and the twins are like the appearance and genetic set.
Here's an interesting process of birth and development.So stay alert to yourself, your health and remember that the twins and the twins - it is primarily the children!