Every kind of dog

If wolves were domesticated several times in various regions, the team would expect to find more than one lineage among modern dogs. These include the labradoodle a cross between a Labrador and a poodle , the cockapoo a cross between a cocker spaniel and a poodle and the puggle the offspring of a pug and a beagle. Recently, the number of deliberately crossbred "designer dogs" has been growing. The dog Canis lupus familiaris is far more variable in size, shape and behavior than any other living mammal, but most experts now believe that all dogs, no matter how different, originated exclusively from a single species: It's also likely that there was just one domestication event, and all domesticated dogs today descended from an ancestral wolf-dog that became someone's best friend long ago. But the standards for breed recognition vary from country to country — the American Kennel Club currently recognizes only breeds.

Every kind of dog


The evidence comes from a study in which a team of researchers at the Royal Institute of Technology in Stockholm analyzed samples of mitochondrial DNA the DNA found in mitochondria, or energy-making structures within cells from dogs around the world. When ancient humans bred dogs for features such as a louder bark for added protection of their owner's property or a docile temperament so it would be less likely to lash out at its owner , they were actually already tinkering with the selection of dog genes. These include the labradoodle a cross between a Labrador and a poodle , the cockapoo a cross between a cocker spaniel and a poodle and the puggle the offspring of a pug and a beagle. They found that all dogs belong to one lineage, which indicates that domestication occurred just one time. But the standards for breed recognition vary from country to country — the American Kennel Club currently recognizes only breeds. Despite the fact that dogs were first domesticated about 14, to 17, years ago, most dog breeds were developed within the last few centuries. The dog Canis lupus familiaris is far more variable in size, shape and behavior than any other living mammal, but most experts now believe that all dogs, no matter how different, originated exclusively from a single species: One of the earliest breeds believed to be purposefully selected for its preferred traits is still around today — the greyhound. Over time, because of natural mutations, climate and human preferences, "breeds became ever more numerous and specialized until they reached the point of modern classification," according to "Guide to Dogs. Recently, the number of deliberately crossbred "designer dogs" has been growing. If wolves were domesticated several times in various regions, the team would expect to find more than one lineage among modern dogs. It's also likely that there was just one domestication event, and all domesticated dogs today descended from an ancestral wolf-dog that became someone's best friend long ago. But all breeds belong to a single species, so scientists have studied the breeds to better understand the workings of evolution, and how such great variation could have arisen within one group.

Every kind of dog


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1 thoughts on “Every kind of dog”

  1. If wolves were domesticated several times in various regions, the team would expect to find more than one lineage among modern dogs.

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