Moreover, because selective reproduction resulted in great variation in shape and size among all dogs, but strong similarity within breeds, researchers now study dogs to understand heredity, evolutionary principles and health conditions in these animals and, by comparison, in humans. 15 нояб. 2012 г.
What causes variations in dogs?
Many exhibit limited genetic diversity, as dog breeds are typically descended from a small number of founders, created by crossing closely related individuals. Further, breeds often experience population bottlenecks as the popularity of the breed waxes and wanes.
Why do dogs have so much genetic variation?
However, the nucleotides that make dogs look different were only found in a few areas of the DNA. These reflect the areas that have changed in the centuries since people started breeding dogs for different traits, creating many different breeds of dog in the process.
Which hormone is responsible for variation in dog size?
Their investigation found that variation in one gene — IGF-1, which codes for a protein hormone called insulin-like growth factor 1, is very strongly associated with small stature across all dog breeds studied.
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