Natural Classification systems are based on the evolutionary relationships and gentic similarities between organisms
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Artifical Classification systems
Artifical Classification systems are based on appearance rather than genes. They're used to identify organisms.
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Kingdoms
Living things are divided into kingdoms
the kingdoms are then subdivided into smaller and smaller groups- phylum, class, order, fmaily, genus. species.
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Genus
A genus is a group of closely-related species.
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Genus
A genus is a group of closely-related species.
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Genus
A genus is a group of closely-related species.
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Species
A species is a group of organisms that can interbreed to producefertileoffspring.
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Difficulties in Classification
It can be difficult to classify organisms into these distinct groups because many organisms sharecharacteristics of mutiple groups.
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Newly discovered species
It is hard to place new species in a group, and they may have features of two different groups, such as a fossil.
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DNA sequencing
DNA sequencing allows us to see genetic differences between different groups.
This allows us to see whether two groups are closely related or not- which helps us identify what group the organism belongs to.
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Evolutionary trees
Evolutionary trees show how closely related different species are to each other (bit like a family tree.)
They show common ancestors and relationships between species. The more recent the common ancestor the more closely related the two species- and the more characteristics they're likely to share
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Evolutionary trees
Evolutionary trees show how closely related different species are to each other (bit like a family tree.)
They show common ancestors and relationships between species. The more recent the common ancestor the more closely related the two species- and the more characteristics they're likely to share
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