Why does same family mating develop mutated offspring?
In: Biology
You get genes from both parents.
If one of those genes is bad, the good one will usually be dominant.
This means you won’t suffer any effects from the bad gene, but you have a chance of passing on that bad gene to your children.
If you have a child with a stranger, it’s unlikely you have the same bad genes. That means you have a relatively small chance of your children having genetic defects.
If you have a child with your sister, there is a good chance they have the same bad genes as you and you are much more likely to pass on those defective genes.
This isn’t too bad in one generation. The chance of passing on bad genes is still low, but it gets much worse if future generations keep having children with relatives.
The chance of both parents having the same defective genes gets higher each generation.
That’s how you get a whole line of royals with hemophilia.
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