22. Charles’ DNA Was Deficient…
Marrying a relative causes genetic problems for the children because of how the genes interact with each other. Usually, if one parent gives a gene that is deficient, the corresponding gene from the other parent cancels it out. For inbred children, though, often inherit the same genes from both parents. Case in point: 25% of Charles’ genes were duplicates, meaning that fully one-quarter of his genes were the same from both parents.