Bryan Sykes is a Professor of Human Genetics at the University of Oxford and a Fellow of Wolfson College. Sykes published the first report on retrieving DNA from ancient bone.
He's also completed a comprehensive DNA study of hair samples from what have been described as Yetis, and other local names, throughout the Himalayas.
His analysis has revealed that the so called Yeti (etc) are in fact the descendants of an ancient admixture of the Polar Bear and the Himalayan Brown Bear. Note that the admixture is ancient, it isn't a recent thing. And this cross breeding is what has produced something that looks like neither a Brown Bear nor a Polar Bear.