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Here is the way it works.

People from two different races have a child. The child will be a mix of those two races.

If that child has a baby with someone from either of those races then those children will share the genes of both parents but the children will have only 25% of the genes of one of the parents. If they have four kids it is likely that 3 will show signs of being mixed and one will not. That one will appear to be of one race.

If any of those children has children then of four children one will show signs of being mixed race and three will not. The three will appear to be of one racial background. However they do carry the genes of both races.

This means that somewhere down the line if they mate with another person who carries mixed racial heritage then there is a chance of the traits surfacing again.

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Q: Your grandfather is mixed race will your children inherit this gene?
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