eli5: what causes genes from generations past our grandparents to be expressed back again?
In: Biology
You have two copies of every gene in your body, one inherited from each parent. Recessive genes only show their effects if both copies of the gene you inherit are recessive. So in the example of getting a trait your grandparent had, both of your parents had a single copy of the recessive gene from their side of the family, and you inherited both.
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