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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]
The term natural selection is most often defined to operate on heritable traits, because these directly participate in evolution. However, natural selection is "blind" in the sense that changes in phenotype can give a reproductive advantage regardless of whether or not the trait is heritable.
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.
The Alaskan husky is a breed of medium-sized working sled dog, developed specifically for its performance as such. [1] [2] [3]Alaskan huskies are the most commonly used type of dog for competitive sled dog racing, both in short-distance sprint racing as well as long-distance expedition races such as the Iditarod Trail Sled Dog Race, [4] the Yukon Quest, [5] and the Finnmarkslopet.
Domestication has been defined as "a sustained multi-generational, mutualistic relationship in which one organism assumes a significant degree of influence over the reproduction and care of another organism in order to secure a more predictable supply of a resource of interest, and through which the partner organism gains advantage over individuals that remain outside this relationship ...
Natural selection, which includes sexual selection, is the fact that some traits make it more likely for an organism to survive and reproduce. Population genetics describes natural selection by defining fitness as a propensity or probability of survival and reproduction in a particular environment.
These arguments, as well as many others, use the vast amount of data Darwin gathered about dogs and cats to support his overarching thesis of evolution through natural selection. He then goes on to make similar points regarding horses and donkeys, sheep, goats, pigs, cattle, various types of domesticated fowl, a large number of different ...
Natural selection is emphasised as the most important mechanism of evolution; large changes are the result of the gradual accumulation of small changes over long periods of time. [ 39 ] [ 40 ] The modern evolutionary synthesis is the outcome of a merger of several different scientific fields to produce a more cohesive understanding of ...