genes

we are done by these "things", they are invisible but his effects are visible: it´s our image.
one of the first man who discover it was g. mendel he noticed the fact that a plant´s seeds has (he didn´t know well what) something witch make his descent all the same, every differents, mostly the same... so he did rules for this:
1º--> in the first generation, all the descendants are the same
2º--> in the second generation, the characters witch disappeared in the first are shown in the descendance
3º--> the different characters are transmited in different ways

those "easy" laws are like the newton´s laws but in biology. so, we can say, he was, is and will be the father of the modern biology.

after, there was more people who, bassing in mendel´s laws, discovered more and more things about the inheritance until now. now almost the whole part of this fact is discovered, but, can we know all about?, only the time will answer..................