Thousands of twins

During the reign of King Hung, we had the legend of two twin brothers Tan and Lang in the area of ​​Trau Cau.Why twins? What are fake twins and real twins? Confusing coincidences of twins. Twin birth rate is increasing, where is the cause?

In the uplifting moment of love between two men and women, wonderful things happen. A stream of sperm in men rushed on, while an egg in a female fell. In the army of sperm strong millions of militants have a fierce competition, the warrior who overcomes the opponent to reach the goal of eggs, then it is possible to combine with eggs into a zygote. This zygote will develop into embryos, cling to the lining of the uterus, be nourished over 38 weeks and a beautiful day, a strange creature is born. The child will be a male, if the Y chromosome-bearing sperm is combined with the egg, it is always the X chromosome and will be a girl if the sperm contributes to the X chromosome.

Usually, but there are many exceptions: twins.

Two Indian twin boys.(Photo: ABC)

Real twins and fake twins

Sometimes, a woman not only loses an egg, but generously loses the two. At that time, there was a chance of a golden gold: the two sperm soldiers along the ' obstacle course ' reached the destination. Two zygotes are formed. Two embryos develop together. Two children come to the world until the month of birth to contribute to the world. Called at the same time, but a few dozen minutes to several hours apart, there are cases up to 36 days apart, as stated in medicine, making these twins different ages (because of being born in the year same month). This type of twin - twin twins, the scientific term dizygotes - is not recognized as ' orthodox twin ', also known as ' fake twins ', or is it ' another egg twin '. The other pair of ' egg twins ' gave birth at the same time but were just normal siblings. They do not have the same genes, not necessarily the same gender, maybe one male and female, the same shape has the same degree.

' Orthodox twins ' are different. After the rule of fertilization: a sperm combined with an egg into a zygote, a rare process occurs: the zygote divides itself into two embryos. Both have the same set of chromosomes, the same genes, the same blood group, the same sex. This type of twin - single-zygote twins, the scientific term is monoygotes - is called ' real twins ' or ' twins with eggs '.

'Twins with eggs' sometimes cause difficulties for criminals. The most accurate method of identification today is based on the bio-identity card, the DNA set, for them, has to give up on not finding a solution yet. In a case, seeing blood on the scene, the biologist was puzzled to give two perpetrators to criminals . to choose his profession.

The strangeness of twins

Twins, especially twins with eggs, are sometimes a challenge to science and a fertile ground for horoscopes to strongly prove their points. The twins' this one and the other 'in many cases, all " horoscopes " such as birth dates, birth places, ancestors' merit supply "leave a complete match so The same form, the same weight, the same clothes, shoes and numbers, the same characteristics, the same state of health, hobbies, talents, department, and so on, because Few of their matching genetic maps could be the basis for explanation.

Kazinski twins - President and Polish Prime Minister (Photo: NYT)

But as two biographies of ' working process ' also have a assembly that is combined into one, it is difficult to understand that the two Kazinski brothers were a few years ago, a President, a Polish Prime Minister. is an example. Not knowing how accurate the statistics are, but the document says, many twins are separated and do not communicate with each other, but growing up, they do the same job, get married to get married on the same day. , again with the same name, laying off the same year, even the dog, their cat raising in the house with the same name. Especially the two twin women, La Velda and La Vona in Ohio (USA), when they grew up, they took two twins, worked together and gave birth to twins.

In many countries, people organize twins' festivals (in the US there is a city for them: the city called Twinsburg - the twin city). At these festivals, it is recorded the bizarre coincidence of twins about the details of life, then proceed to vote, awarding the most similar pairs, the highest pair, Most powerful, lightest, lowest, most talented. In addition, there are also conjoined twins who live together for life without agreeing to separate surgery, to share their fate.

Are twins inherited?

Probably yes. Those who have twins traced out, among close or distant relatives, find a twins. Many localities have very high rates of twins, because in the region, there have been many blood ties in the past. Is twins also a ' something ' encoded in genes?

Even one person can give birth to twins several times, reinforcing the hypothesis that there is a gene called ' twins '. Barbara Zulu, from South Africa, gave birth to three female-female twins and three male and female twins for seven consecutive years (1969-1973). In 1960, Mrs. Anna Steynvait in Johanesburg twins twice in 10 months. Mary Jonas of Chester (England) gave birth to 15 male and female twins. But the strangest is a case that is still considered to be the most precious of mankind, carefully recorded in the literature: the wife of a Russian farmer, Feodor Vasilyev (1707-1782), gave birth to 69 children ( the most in the world) is due to multiple pregnancies. In 27 births, twins were 16 times, triplets 7 times, four times quadruple, between 1725-1765, and only 2 children died prematurely.

Twins tend to increase

The statistics of the World Health Organization (WHO) recorded an increasing proportion of twins. This phenomenon is social. In many countries, population decline is worrying. The state has policies to encourage childbirth to achieve equilibrium, while couples who do not like to give birth more. Raised, one can be raised, and the state always has a special care regime with twins. There are also detailed care and follow-up procedures for twins who are pregnant, because the pregnancy process of twins is more prone to complications than normal pregnancies. Birth is carried out either naturally or with the intervention of surgery. This second method is preferred because it helps to give birth quickly and easily, and the pregnant woman needs only 10 days postpartum to recover to return to normal life. Therefore, many couples choose to have twins by the method of stimulating the ovaries that medicine allows for much water.

On the other hand, to address infertility cases, in vitro fertilization has become very popular and within reach of many developing countries. In order to ' make sure ' it is common for multiple embryos to be fertilized, this one can be broken and sometimes ' parked ' both, even three embryos implanted in the womb of the mother (in many countries there is a law prohibiting transplantation 3 embryos).

A small factor but also contributes to the creation of twins. Those are modern women who are busy with their own careers that tend to marry later and later. Pregnancy at ages 36-38 is the peak of twin births.

With the above reasons, the rate of twins keeps increasing, it is not strange.