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Why are there not breeds of humans like breeds of dogs?

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There are, in a way. They call them 'races.' Although, in reality, human 'races' are more like different coat patterns on the same dog breed than they are like different breeds. read more

A breed is a variety of dog with SPECIFIC characteristics that are deliberately maintained by active selective breeding and artificial restriction of gene flow between breeds by humans. The reason humans do not have breeds like dogs is because humans have never done (or if tried, never succeeded for long) that kind of active selection for specific traits and restriction of gene flow to themselves, to the same degree. read more

Well, in effect, there are different "breeds" of humans (black and white people, for example). Dogs of different breeds can cross-breed, creating different types of dogs. Humans do that too. Black and white people have children together all the time. Interracial children are effectively a different "breed" of human. read more

I'm not sure I understand the question, but if what you are asking is whether there are human races in the sense that there are dog breeds, the answer is "no". A breed is a group of domestic animals or plants with homogeneous genotype and phenotype, created by humans through controlled breeding, in other words, through artificial selection. read more

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