In the future, through selective abortion or the more sophisticated selection of embryos in vitro, couples will be able to screen out potential children with undesirable genes. (religion-online.org)
Peas in a Pod: Expression of Undesirable Genes in Ferrets -LRB-. (ferret.org)
You can't blame Max for not knowing, polygenetic traits were unknown at the time; but in selecting Klodo, he selected for some very undesirable gene combinations that favored joint problems like hip dysplasia and cruciate ligament ruptures. (2ndchance.info)