While we are often skeptical of Darwinian theory – part of it is non-controversial. Survival of a group is based on reproductive ability, and a hereditary (genetic) trait that prevents reproduction means you won’t have any children, meaning the trait won’t be passed on. Infertility can not be the result of inheritance since if your parents had the trait, you wouldn’t be here. Hereditary infertility is an oxymoron.
The above refers to dominant traits. Recessive traits can interfere with having children, but these require both parents to have the “recessive” trait, and then there is typically only a 25% chance of a child having the trait. Dor yeshorim addresses this with prenatal testing for the more common recessive traits that need to be avoided (again, both have to have the same gene). To minimize the chance of two people sharing a recessive trait, try to avoid marrying a close relative. Your first cousin may share a lot of your recessive traits, a total stranger won’t.