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Different dog breeds

 
Question:  How did there get to be so many different types of dogs?
Angelique Demers, Allison Brown, Nicole Fillippidis,
Glen Crest Jr. High

Answer:  At first, as for any animal, varieties are created by genetic differences 
caused by mutation, followed by restrictions in breeding so that similar types mated 
together and had offspring of their type. In dogs, this has been greatly speeded by 
controlled cross- and in-breeding for commercial uses.  --ProfBill

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