Surprisingly, inbred isle royale wolves dwindle because of fewer harmful genes

The tiny, isolated gray wolf population on Isle Royale has withered to near-extinction, but not because each animal carries a large number of harmful genes, according to a new genetic analysis. Instead, each one has been more likely to inherit the same harmful recessive alleles from both parents. This pattern enables expression of related genes as physical deformities,
Source: EurekaAlert, https://www.eurekalert.org