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The Siberian Husky is a breed of medium-sized working sled dog. The breed belongs to the Spitz genetic family. It is recognizable by its thickly furred double coat , erect triangular ears, and distinctive markings, and is smaller than the similar-looking Alaskan Malamute .
An Alaskan husky. The most commonly used dog in dog sled racing, [16] the Alaskan husky is a mongrel [17] bred specifically for its performance as a sled dog. [18] The modern Alaskan husky reflects 100 years or more of crossbreeding with English Pointers, German Shepherd Dogs, Salukis and other breeds to improve its performance. [19]
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, ...
The Alaskan husky is not an officially recognized breed by any kennel club, nor does it have a formal breed standard. [6] Unlike breeds developed for the show ring, the Alaskan husky is instead a product of careful selection for desirable sled dog traits from various other breeds, such as aptitude for pulling, endurance, speed, intelligence, appetite, and tolerance of extreme weather.
Alaskan husky. Crossbreeding has played a key characteristic in the development of sled dogs with various crossbreeds developing to meet the specific needs of the era and geographical region, including the Mackenzie River husky, in which European breeds were crossed with Native American dogs to produce a powerful and hardy freighting dog in the 19th century, and the Alaskan husky, bred ...
These breeds possess distinct traits related to morphology, which include body size, skull shape, tail phenotype, fur type and colour. [15] The difference in size has been attributed to a lncRNA variant in the IGF1 region arisen in wolves from northern latitudes c. 53.000 years ago and fixed by natural and subsequently by human selection. [16]
The article was the first announcement of the Darwin–Wallace theory of evolution by natural selection; and appeared in print on 20 August 1858. The presentation of the papers spurred Darwin to write a condensed "abstract" of his "big book", Natural Selection. This was published in November 1859 as On the Origin of Species.
Natural selection can act on specific alleles both directly or indirectly. [ 29 ] [ 22 ] [ 34 ] In direct selection, the frequency of the selected allele is favored to the extreme. In cases where an allele is indirectly selected, its frequency increases due to a different linked allele experiencing selection ( linkage disequilibrium ).