Genes and DNA are two things that help you store information. DNA is a wonderful molecule the is in every creature. It stores information that helps the creature to be the kind of creature it is supposed to be. Dogs have thousands of genes. Each creature is given two copies of genes, one from the mother and the other from the father. Most of the time it is either dominant or recessive. If it dominant it will win and the information will be used. If it recessive gene in the dog, it will not be used when the dominant gene is present. It is "masked". It is there; it just doesn't do anything for the animal!
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