Inbreeding generally stops being a notable factor around 4th degree relation between parents. Even first cousins, 3rd degree relatives, only have about a 6% risk of an anomaly at birth when having a child together, compared to the 3% normal rate for all pregnancies. There’s likely been a LOT of inbreeding in any one person’s family history.
The nice thing is that once a new non-relative is added to the mix, the risks associated with past inbreeding largely go away; you only pass on 1 copy of your genes to your kid, so even if you’re personally affected by a family history of inbreeding giving you a bunch of identical copies, if your kid’s other parent isn’t related to you, their copies should be different from yours, and the kid will have 2 different copies just like anyone else, helping protect them from recessive familial conditions and the like.
Inbreeding generally stops being a notable factor around 4th degree relation between parents. Even first cousins, 3rd degree relatives, only have about a 6% risk of an anomaly at birth when having a child together, compared to the 3% normal rate for all pregnancies. There’s likely been a LOT of inbreeding in any one person’s family history.
The nice thing is that once a new non-relative is added to the mix, the risks associated with past inbreeding largely go away; you only pass on 1 copy of your genes to your kid, so even if you’re personally affected by a family history of inbreeding giving you a bunch of identical copies, if your kid’s other parent isn’t related to you, their copies should be different from yours, and the kid will have 2 different copies just like anyone else, helping protect them from recessive familial conditions and the like.