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More on Characteristics —
Species
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Organisms are defined as the same species if
they can interbreed to produce fertile offspring
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1
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Some organisms don't need to interbreed to produce offspring
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Bacteria for example reproduce
reproduce
by splitting in half
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It is possible for two closely related species to breed and produce an offspring called a hybrid
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However some hybrids are fertile
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This contradicts the definition of species because two
different species of duck have bred and produced a fertile hybrid offspring
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The fertile hybrid ducks can then interbreed with other hybrids or other closely related ducks
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3
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Members of the same species are sometimes difficult to identify because of variation within the
species
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g
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Groups of related populations that live in neighbouring areas are called ring species
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Interbreeding between the neighbouringpopulations form a 'breeding chain' , but the
each end of the chain can never breed because of the distance factor
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13
It's difficult to tell if populations of ring species are different species, because there is a gradual
change of characteristicsbetweenthe species
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(d 09)
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