Why do some children show traits that neither of their parent's display?
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Usually very rare. Those odds are significantly different between physical traits and things like personality traits that can also be influenced by environment and experience as opposed to solely genetic.
If you do the Punnet square based on both parents having an unexpressed trait, there is about a 25% chance that the offspring will not show that particular trait.
Both parents carry many recessive genes and when the right ones line up, you get a trait that neither parent exhibits.
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