Im talking about humans.
What about animals?
In: Biology
If the deformity is caused by genes, it is usually because of recessive genes (if a dominant gene caused deformities, they may not reproduce to pass the genes on).
In general, if there is a dominant gene from one parent and a recessive gene from the other parent, the dominant gene will be expressed. But the child would still carry the recessive gene.
If 2 people are in the same family, both with 1 dominant and 1 recessive gene for this deformity, they have a chance to have a child with 2 recessive genes, expressing the deformity.
This is a very simplified explanation, but it’s the simple idea that 2 people from the same family would likely carry the same gene, whereas strangers would not.
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