Genes

Whether you are natullary tall or small , blond or brown haired ,blue or green eyed , left or right handed ;depends largely on the genes in your body cells :

A gene is a part of one of the choromose threads inside the ncleus of each cell, those control the characteristics which are passed on from parents to their children when an egg is fertilized two sets of genes are put together one set cames from the father in the sperms chromosomes and the other set from the mother in the egg´s chromosomes ach set carries half of the tajal instruccions for the new human those gones passed carry instruccions for the nero human those genes passed carry instruccion about body characteristics like height hair color and eye color.

dominant genes: the genes with “stronger” of dominat instructions will control what happens.

Heredity: is the passing on of characteristics from one generation to the next.

Chromosomes: Are fine theads of material for carry instructons. There are 10.000 genes on each chromosomes.

Human cells have 46 choromosomes . sperm and eggs have only half that number when a sperm and egg join up a new being begins to grow.

First stage: each choromosome makes an exact copy of Itself.