In No.Amer. #wolves have gray or black coats. we now know that black wolves are either #homozygous or #heterozygous for a gene that is also related to resistance to #caninedistemper black coats were maintained through #heterozygoteadvantage in, & #matechoicepreference for, black-coated wolves in areas where canine distemper is endemic even though gray-coated wolves have higher success when the virus is absent.#Genesin Context
https://www.science.org/doi/10.1126/science.adf3765