Speciation
SpeciationSpecies: all members of apopulation that can breedunder natural conditionsand produce fertileoffspring.(With som...
SpeciationReproductive isolating mechanism: The term given to anobstacle that prevents inter-species breeding.
Think. Pair. Share.Think of as many reasons are you can to explain whyanimals of different species would be unable to bree...
Reproductive Isolating MechanismsThere are 2 types:1) Prezygotic (preventing egg fertilization)2) Postzygotic (zygote unab...
Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:i) Behavioural Isolation: Differences in court...
Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:ii) Temporal Isolation: Different breeding tim...
Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:iii) Ecological Isolation: Organisms have diff...
Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:iv) Mechanical Isolation: Incompatible anatomi...
Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:v) Gametic Isolation: Male gametes are unable ...
Reproductive Isolating Mechanisms2) Postzygotic isolatingmechanisms include:i) Zygotic Mortality: Thefertilized egg can no...
Reproductive Isolating Mechanisms2) Postzygotic isolating mechanisms include:ii) Hybrid Inviability: Hybrid organism dies ...
Speciation2) Postzygotic isolating mechanisms include:iii) Hybrid Infertility: Hybrid organism healthy but sterile.       ...
SpeciationSpeciation is the creation of a new species. The newspecies evolved from an already existing species.        The...
SpeciationThis may occur in 2 main ways:1) Allopatric Speciation:Physical separation of members of aspecies will place dif...
SpeciationThis may occur in 2 main ways:1) Allopatric Speciation:Different traits will be selected for survival and thepop...
SpeciationThis may occur in 2 main ways:2) Sympatric Speciation:Species of a single population my be selected for theirext...
SpeciationThis may occur in 2 main ways:2) Sympatric Speciation:These extreme traits become the basis for 2 differentpopul...
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11u bio 12

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  • Grolar (Pizzly) Bear
  • 11u bio 12

    1. 1. Speciation
    2. 2. SpeciationSpecies: all members of apopulation that can breedunder natural conditionsand produce fertileoffspring.(With some exceptions: thereare some animals of differentspecies that can have fertileoffspring)
    3. 3. SpeciationReproductive isolating mechanism: The term given to anobstacle that prevents inter-species breeding.
    4. 4. Think. Pair. Share.Think of as many reasons are you can to explain whyanimals of different species would be unable to breed.Ex. Why wouldnt the following animals have offspring?Dog and CatHousefly and FruitflySpider and ScorpionRaspberry and BlueberrySalmon and TroutMoose and deerCardinal and Bluejay
    5. 5. Reproductive Isolating MechanismsThere are 2 types:1) Prezygotic (preventing egg fertilization)2) Postzygotic (zygote unable to reproduce)
    6. 6. Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:i) Behavioural Isolation: Differences in courtship.
    7. 7. Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:ii) Temporal Isolation: Different breeding times/seasons. The western and eastern spotted skunks breed at different times of the year (fall and late winter).
    8. 8. Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:iii) Ecological Isolation: Organisms have different habitats. While similar, these kingfishers rarely leave their habitats for a chance to meet the other kingfishers.
    9. 9. Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:iv) Mechanical Isolation: Incompatible anatomies. This beetle penis has spikes on it - a mechanical barrier to reproduction with other species.
    10. 10. Reproductive Isolating Mechanisms1) Prezygotic isolating mechanisms include:v) Gametic Isolation: Male gametes are unable to fertilizethe egg because they do not recognize it. In some species the females lay unfertilized eggs. The male must then cover them with its sperm.
    11. 11. Reproductive Isolating Mechanisms2) Postzygotic isolatingmechanisms include:i) Zygotic Mortality: Thefertilized egg can notdevelop properly.
    12. 12. Reproductive Isolating Mechanisms2) Postzygotic isolating mechanisms include:ii) Hybrid Inviability: Hybrid organism dies before birth orcan not survive to maturity. A leopon (lioness and leopard) or lipard (lion and leopardess) is sterile and has a very short life span. None have grown to maturity.
    13. 13. Speciation2) Postzygotic isolating mechanisms include:iii) Hybrid Infertility: Hybrid organism healthy but sterile. Beefalo (domestic cow and buffalo)
    14. 14. SpeciationSpeciation is the creation of a new species. The newspecies evolved from an already existing species. There are many different species of fruit flies.
    15. 15. SpeciationThis may occur in 2 main ways:1) Allopatric Speciation:Physical separation of members of aspecies will place different selectivepressures on each population.
    16. 16. SpeciationThis may occur in 2 main ways:1) Allopatric Speciation:Different traits will be selected for survival and thepopulations will evolve independent of each other.
    17. 17. SpeciationThis may occur in 2 main ways:2) Sympatric Speciation:Species of a single population my be selected for theirextreme traits, such as colour or behaviour (disruptiveselection).
    18. 18. SpeciationThis may occur in 2 main ways:2) Sympatric Speciation:These extreme traits become the basis for 2 differentpopulations with different selective pressures as theygrow apart. The hawthorn fly species (left) gave rise to apple maggot flies (right) , which prefer to eat apples instead of hawthorn fruits

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