What makes an ancestor to have stronger genes over others in a family tree?

How true is that an ancestor have more influence than all the others in the inherited traits? and how common is it? what determines this?

It has to do with "more strong genes "or with" dominant genes, "but a process called recombination during the early stages of the gametes that determine which genes are passed to the fore in the fetus. Otherwise, everyone has the same hair / eye color, same skin tone, everyone would be the same height, weight, etc. (As shown Darwin.)

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The Ancestor`s Tale (Hardcover) $40.73 From the scientist who penned THE SELFISH GENE, this exploration of Earth`s family tree goes backward in time by a way of a series of Chaucer-like tales focusing on a variety of life forms whose ancestry converges with our own. Gradually, Dawkins guides the reader in a regress that ultimately stretches to the primal bacterium that was the ultimate ancestor of all life on this planet. THE ANCESTOR`S TALE was named a New York Times Notable Book for 2004.

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