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9 Cards in this Set
- Front
- Back
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Valid group?
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Also called a CLADE. It is the ancestral node, and everything beyond it. If it excludes something, it is not a valid grouping.
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Trees are ideally ...
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nested, and dichotomous.
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Tree that's not dichotomous?
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POLYTOMY. Likely means that there isn't enough information to differentiate the third into this or that group, and so they are just thrown in with another group who they seem to have shared characteristics with.
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Another name for a CLADE?
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A monophyletic group.
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Taxon/.
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Named group at any level of classification.
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Two types of non-valid taxon?
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Paraphyletic group -- excludes some groups of the ancestor.
Polyphlyetic group -- When you add another common ancestor, or lacking a common ancestor that unites the group. |
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Homologous traits?
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Traits in a monophyletic group that are similiar because of common ancestry
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Analgous traits?
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Structures in different species that are similar due to separate ancestries.
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How to tell homology from analogy?
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Gather all available evidence and then choose the most parsimonious explanation.
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