Genes

A gene is a string of nucleotides that form the ADN. The genes have the informacion about us: if you are blonde or brown, if you are short or tall... The discoverer was Gregory Mendel, a friar that worked with peas.

The genes are inherited, and you can know the features of the second, third or fourth generation of an animal or a plant. All of this with the Mendel's rules. In the first generation you can find the middle with the recessive gene and the other half with the dominant gene: if you pair a brown mouse with a white mouse, in four calves two will be white and two will be brown.

You can apply this rules for all phenotypes (the appearance), for the blood, etc.

The genes must have a specific order, because, if they haven't this order, there are a mutation, usually severe.

With the genes you can know a lot of thigns, but not all.