Speciation and Phylogeny Flashcards

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1
Q

Evolution Processes

A

Natural
Genetic
Mutation

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2
Q

Barriers lead to

A

Speciation

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3
Q

Natural Selection

A

Shows phynotype’s more favored offspring

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4
Q

More Favored Offspring have

A
  • More favorable characteristics

- Must vary in characteristics

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5
Q

4 types of natural selection

A
  • Directional
  • Stabilizing
  • Disruptive
  • Balanced
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6
Q

2 types of evolution

A
  • Convergent

- Divergent

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7
Q

Convergent

A

evolve from different origins, similar traits but no common ancestry (sharks vs. dolphons)

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8
Q

Divergent

A

evolve in diverse directions from common point, most things

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9
Q

Directional

A

one more favored to survive than others

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10
Q

Stabilizing

A

middle/average range more favored to survive

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11
Q

Balanced

A

no change, all able to survive

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12
Q

Disruptive

A

both opposite phynotypes favored to survive

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13
Q

Gene flow

A

transfer of gene variation

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14
Q

Increased gene flow

A

new population

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15
Q

Speciation

A
  • from single ancestry
  • splitting event
  • must form 2 distinct species
  • adds branches to tree
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16
Q

Species

A

evolutionary independent

17
Q

3 major species concepts

A

Biology
morphospecies
phylogenetic

18
Q

Biology specie concept

A
  • same species if they can breed
  • result in reproductive isolation
  • Prezygotic
  • Postzygotic
19
Q

Prezygotic

A

before fertilization, prevents mating

  • Temp/timing
  • Habitable
  • Behavoral
  • Gamietal
  • Mechanical
20
Q

Postzygotic

A

offspring do not survive or cannot reproduce

  • hybrid viability
  • hybrid sterility
21
Q

Morphospecies

A

use different morphology to distinguish species

  • group by looks
  • sexual dymorphent
22
Q

Phylogenetic

A

genetics

  • from same ancestry
  • each branch has diff genes
  • smallest used but based on testable facts
23
Q

Allopatry

A

2 species geologically separated

  • can’t breed
  • no gene flow
  • Dispersal vs. Vicariance
24
Q

Dispersal

A

chose to move and form new colony

  • genetically isolated by each other
  • geo iso = gene iso
25
Q

Vicariance

A

physical splitting of habitat