Sometimes at mom even four kids are born on light two, three or at once. Call them sometimes twins, and sometimes – twins or triplets respectively. In what a difference between twins and twins?
Concept of medicine
First of all, in traditional medicine of such concepts as "twin" and "triplet" does not exist. The terms "monoovular twins" and "nonidentical twins" are used. In the people of nonidentical twins call twins, and monoovular – actually twins. At the same time both those, and others can be understood as the word "twins" equally.
In case one impregnated ovum in a uterus was divided into two, three or even four parts, monoovular twins develop – still call them identical. The mechanism of birth of twins or triplets very much differs. They appear when two and more ova are impregnated by different spermatozoa and develop independently of each other.
Similarities and distinctions of twins and twins
Monoovular twins always same-gender. At first sight they usually seem is indiscernible similar at each other. They are often confused even by mothers with fathers, especially at early age. Quite often during an infancy the monoovular twins manage "to exchange" names more than once, and further can quite wear the same clothes. At such twins always one for two color of eyes, a shade of skin and hair, common features of the person. As for nonidentical twins – twins – that they can be same-gender or different floors. At the same time between them usually it is no more similarity, than between ordinary brothers and sisters. That is, in principle, similarities can practically not be at all – if, for example, one child "went to mom", and another - "to dad".
Twins can be the different growth, build – in certain cases even different skin color (if, of course, their parents belong to different races).
Monoovular twins have an identical group and a factor of blood, an identical set and a ratio of genes. They if necessary can always serve for each other as donors of blood, fabrics and bodies. Of course, at all this they are after all different people. You should not forget that in sexual and somatic cages to a certain frequency there are mutations. Besides, each of twins accumulates the personal life experience after all independently.
At monoovular twins the majority of diseases repeats.
The heredity of nonidentical twins can be similar or various, as well as at the brothers and sisters born in different terms, and their bodies and fabrics can quite be incompatible at change. It is almost impossible to plan the birth of twins or twins, alas. However it is known that twins are more often and triplets are born at women in whose families there were already polycarpous pregnancies. Besides, the probability of the birth of twins increases at the age of 35-40 years. Monoovular twins are born with an identical frequency at any age.