Why is it that animals like cats, dogs, butterflies, spiders, everything have different varieties in the same species(doberman, labrador etc in dogs, persian cat etc in cats, different varieties of butterflies, diffferent variety of spiders like the ones found in our homes and the big poisonous ones in forests and many more) , but humans are just one species(Homo sapiens) ????

Asked by  | 30th Oct, 2012, 06:43: PM

Expert Answer:

The term breed is used in case of animals. A breed is a specific group of domestic animals or plants with a homogeneous appearance, behavior, and other characteristics that distinguish it from other animals or plants of the same species, and arrived at through selective breeding. But there is no scientifically accepted definition of the term. A breed is therefore not an objective or biologically verifiable classification.
 
In humans, we use the term 'race' and not breed and even this is not a term that is uniformly agreed by scientists. Human races are genetically distinct populations within the same species. In biology the term "race" is used with caution because it can be ambiguous. To categorize humans into different races, various criteria like heritable phenotypic characteristics, geographic ancestry, culture, history, language, physical appearance, ethnicity etc. are considered. Examples of races are European, African, Asian, Chinese, Indian etc. But note that there is only one species of humans, i.e. Homo sapiens.

Answered by  | 31st Oct, 2012, 08:41: AM

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