Chapter 26 Phylogeny Flashcards

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1
Q

Phylogeny

A

Evolutionary history of a species or group of related species

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2
Q

Discipline of Systematics

A

Classifies organisms and determine their evolutionary relationships through a computer program

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3
Q

Taxonomy

A

Scientific discipline concerned with classifying their evolutionary relationships

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4
Q

Who published a system of taxonomy based on resemblance?

A

Cardus Linnaeus

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5
Q

Bionomical Nomenclature

A

2-part names for species and hierarchical classification

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6
Q

Breakdown of bionomical nomenclature

A
  • First of the name: Genus and is capitalized
  • Second of the name: Species and is italicized
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7
Q

Taxon

A

Taxonomic unit at any level of hierarchy

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8
Q

Phylogenetic Tree

A

Evolutionary history of a group of organisms that can be represented

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9
Q

Sister Taxa

A

Groups that share an immediate common ancestor

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10
Q

Taxonomic groups from broad to narrow

A

domain -> kingdom -> phylum -> class -> order -> family -> genus -> species

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11
Q

Homologies

A

Phenotypic and genetic similarities due to shared ancestry

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12
Q

Morphology

A

Organisms with similar morphology or DNA sequences are more likely to be more closely related

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13
Q

Homology

A

Similarity due to shared ancestry

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14
Q

Analogy

A

Similarity due to convergent evolution

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15
Q

Convergent evolution

A

Occurs when similar environmental pressures and natural selection produces similar (analogous) adaptations

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16
Q

Homoplasies

A

Analogous structures or molecular sequences that evolved independently

17
Q

What doesn’t the phylogenetic tree show?

A
  • not phenotypic similarities
  • doesn’t indicate when evolution occured or by how much
  • should not be assumed that a taxon evolved from the taxon next to it
18
Q

Rooted Tree

A

Includes a branch to represent the last common ancestor of all taxa in the tree

19
Q

Basal Taxon

A

Diverges early in the history of a group and originate near the common ancestor

20
Q

Polytomy

A

A branch from which more than two groups emerge

21
Q

Cladistics

A

Groups of organisms by a common descent

22
Q

Clade

A

Group of species that includes an ancestral species and all to descendants

23
Q

Monophyletic Clade

A

Clade that consists of the ancestor species and all its descendants

24
Q

Paraphyletic Clade

A

Grouping of species that consists of an ancestral species and some, but not all of the descendants

25
Q

Polyphyletic Clade

A

Grouping of species that includes distantly related species but doesn’t include most recent common ancestor

26
Q

Shared Ancestral Character

A

Character that originated in an ancestor of the taxon

27
Q

Shared Derived Character

A

Evolutionary novelty unique to a particular clade

28
Q

Outgroup

A

Species or group of species that diverged before and are closely related to the ingroup

29
Q

What are the 3 domains?

A
  • eukarya
  • bacteria
  • archaea
30
Q

What are the 5 kingdoms?

A
  • Monera (prokaryotes)
  • Protists
    -Plantae
    -Fungi
    -Animalia
31
Q

What is horizontal gene transfer?

A

Movement of genes from one genome to another

32
Q

Paralogous Genes

A

As a result from gene duplication

33
Q

Orthologous Genes

A

Found in a single copy in the genome and are homologous b/w species

34
Q

Principle of Maximum Likelihood

A

States that a tree can be found that reflects the most likely sequence of evolutionary events

35
Q

Maximum Parsimony

A

Assumes that the tree that requires the fewest evolutionary events is the most likely