The prenatal environment

The first environment in which the fetus develops is the cytoplasm, the fluid that bathes the nutritive cell, exclusively supplied by the mother. It is there where the fusion of genetic material from both parents.

Some experiments with animals have shown the effect of uterine environment on certain characters: some embryos of mice, with exactly the same genetic background, were implanted on different females. After their birth, found that their motor development, their activity reflects the females were different depending on which had been grafted embryos.

It was also noted that a small female, located between two male mice in the maternal womb, during the whole pregnancy was in adulthood more aggressive with the intruders. This was because it had received hormone testosterone released by male neighbors. All these tests corroborate the potential impact on the environment prenatal development and evolution of the fetus.

The manner in which a woman lives her pregnancy, if you suffer from stress, or fatigue, their way of eating, if you smoke or drink alcohol ... all this affects the development of the nervous system of their future child. For nine months, the fetus develops in a very exclusive, only for him. This may explain in part the differences so obvious that there are occasions between brothers, despite the 50 per cent of the genetic heritage and a common education like a priori.

But as a general rule, there are physical characteristics that confer a certain air of family among the brothers: the hair, nose, chin ... even how to express themselves or face a particular problem. It is also known that the movements can be hereditary, since to coordinate the muscles, brain cells send nerve impulses the same as that of their parents.