isolating mechanisms during speciation T. 29 final exam.txt

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Author:
rincrocci
ID:
122681
Filename:
isolating mechanisms during speciation T. 29 final exam.txt
Updated:
2011-12-11 12:24:53
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isolating mechanisms
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evol bio
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  1. Geographic Isolation
    • PREZYGOTIC
    • a. by VICARIANCE: Glaciation of Kamchatka peninsula in Russa sep. polar bear pop from ancestral brown bear pop.
    • b. by DISPERSAL: rare island hopping across OCEAN barriers allowed Reproductive isolation among Hawaiian populations of Drosophila
  2. Temporal Isolation
    • PREZYGOTIC
    • Isolation by hours, days or SEASONS
    • ie, In N America, Eastern spotted skunks breed in Spring, isolating them from Western spotted skunks- breed in Fall
  3. Habitat Isolation
    • PREZYGOTIC
    • by sympatry (same geograph region) or parapatry (diff geo region)
    • Rhagoletis pomonella feeds on APPLES, diverged from the Ancestral population feeding on Hawthorn fruits in Eastern N America.
    • These maggots also isolated by breeding times (temporal) and genetic diff
  4. Behavioral or Pollinator isolation
    • PREZYGOTIC
    • White Eyed Drosophilia: lower mating success than red-eyed. even white eyed don't like to mate w/white eyed
  5. Mechanical Isolation
    • PREZYGOTIC
    • Different species of Dragonflies cannot mate b/w 4 wings do NOT FIT properly to mate
  6. Gametic Isolation
    • PREZYGOTIC
    • Male GAMETES from one deer species CANNOT survive in female reproductive tract of another deer species
    • sperm doesn't survive
  7. Ecological F1 Inferiority
    • POST-ZYGOTIC
    • EXTRINSIC barrier
    • Anthoxanthum odoratum hybrids b/w metal tolerant and intolerant cannot compete w/either parental variety.
  8. Behavioral F1 Inferiority
    • I'm Not COOL ENOUGH
    • POST-ZYGOTIC
    • EXTRINSIC barrier
    • Canis lupus (gray wolf) crossed w/Canis latrans (western coyote) yield F1 HYBRIDS (northeastern coyote), but these have LOW mating success rate
  9. F2 Hybrid Breakdown
    • POST-ZYGOTIC
    • INTRINSIC barrier
    • Gossypian barbadense (Egyptian cotton) crossed w/Gossypium hirsutum yield F1 hybrids that are Fertileā€¦BUT when these F1s CROSS = INVIABLE F2 hybrids
  10. F1 Hybrid sterility
    • POST-ZYGOTIC
    • INTRINSIC barrier
    • Equus caballens mares (female horses) mating w/Equss ascius stallions (male donkeys) = mules (Healthy & strong, but usually STERILE..males always are)
    • Horses have different diploid chrom than donkey
  11. F1 Hybrid inviability
    • POST-ZYGOTIC
    • INTRINSIC barrier
    • Copper-tolerant populations of yellow monkey flower (Mimulus guttatus) when crossed w/copper sensitive populations produce mostly INVIABLE F1 hybrids based on mutant allele for copper tolerance arising in copper sensitive pop 100yrs ago

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