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Why there are two versions for each trai...

Why there are two versions for each trait in each child ? What trait will be seen in the child from these two versions ?

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The rules for inheritance of traits in human beings are related to the fact that both the father and the mother contribute practically equal amounts of genetic material to the child. This means that each trait can be influenced by both paternal and maternal DNA. So, we can say, that for each trait there will be two versions in each child.
The dominant trait is expressed in the child.
Example : Child may have genes for both free and attached earlobes inherited from mother and father, but only free earlobe trait is seen in child. This is because attached earlobe is recessive trait.
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