isolating mechanisms during speciation T. 29 final exam.txt

  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
Author
rincrocci
ID
122681
Card Set
isolating mechanisms during speciation T. 29 final exam.txt
Description
evol bio
Updated