Dominant is the strong one and the Recessive is the weak one. Traits that you get from your parents are compared to each other to determined which trait you will have. For example, if your dad has a brown hair and your mom has blonde hair. Your dads brown hair is recessive which means blonde hair is the dominant, which means you will have blonde hair because the dominant over powers the recessive trait/DNA.
All of your traits have to be compared to find what trait your offsprings will have or what are they goin to look like. this could be compared or seen whose one is dominant by using a punnett square. A punnett square is 4 small box splinted from a big box. If you dont know what it look like its in the left hand corner. Each parent has to have 2 letters that is goin to be compared with the other parent then use the punnett square to find out which one is the dominant one.
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