Im talking about humans.
What about animals?
In: Biology
There are “dominant,” and “recessive,” genes. A recessive gene needs to be provided by both the mother and the father in order for the child to get that trait, while a dominant gene only needs to be possessed by 1.
However, a person can have a recessive gene and not show it. Sometimes that recessive gene is just for a hair color they don’t have, other times it’s for a disability or health issue. Even though this trait isn’t visible, they can still pass that trait to their children.
Since closely related partners would have similar genes, if they have a child together it raises the risk that these hidden genes end up matching and causing the child to have that recessive gene.
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