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burke828 t1_iwffkjp wrote

Each parent has 2 sets of DNA, which aren't always the same. Lets say you have a father with one gene for red hair and one gene for blond hair, and a mother with one gene for red hair and one gene for brown hair. Brown hair has a dominant gene over blond or red hair, and blond hair is more dominant than red hair.

To determine the possibilities for hair color, you make a punnet square.

​

Red Hair Gene R Brown Hair Gene B
Red Hair Gene R RR (red hair) BR (brown hair)
Blond Hair Gene b bR (blond hair) Bb (brown hair)

See how you can have 3 different hair colors from 2 parents? Apply that to literally every gene and hopefully you can see how you end up with children with distinct genetics.

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