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26 Cards in this Set
- Front
- Back
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morphospecies
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form & structure (when criterion of reproductive isolation cannot be applied)
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phylogentic
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evolutonariy development (ancestral)
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biological
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species that actually inter breed in nature & produce fertile offspring
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ecological
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organism adapted to a particular set of rescources from discrete phentic clusters; species as a set of organism exploiting a single niche
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SYMPATRIC SPECIATION:
where does it occur? |
when species live close enough to interbreed
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SYNPARTIC SPECIATION:
WHY DOES IT OCCUR? |
DIVERGENT SELECTION CAUSES PREFERED MATING W. GENETICALLY SIMILAR INDV. BUT NOT W. PARENT POP FROM ANOTHER
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SYMPARTIC SPECIATION:
CONDITIONS |
gene mutations that is the passed down
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pre(zygote): ecological
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prefered habitats & do not meet indv of other specie
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pre zygote: temporal
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diiferent times or amting seasons
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pre zygote: behavoral
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meet but choose members of own species
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pre zygote:mechanical
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co pop is attempted but transfer of sperm does not take place
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pre zygote: gametic
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sperm takes place but egg is not fertilized
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post m: h. inviabiltity
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embryo forms but reduced viablity
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post m: h. steriality
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viable but resulting adult is sterile
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post m: breakdown
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f1 is viable but f2 is inviable or sterile
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allopartic occurs where?
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extrinsic prevents two + groups from mating regulary causing lineage to speciate
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allopartic consequences
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restricts gene flow & remain two genetically distinct pop
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allopartic adaptive radiations
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formation of # of diverse species from single ancestor
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phyletic
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change occurs slowly & at constant rate -> change in lineages spread uniformly over time
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punctuated equ.
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species remain in stasis, unchanged, bc it requires special conditions for isolation to occur -> stasis is broken up bby burst of speciation
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evo noveltioes: exacptions
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shift in function of a trait; evolve to serve a function but subsequently serves another
ex: brids feathers first used for temp control -> flight |
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evo devo: allomatric growth
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part of organism grow at diff. rates
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evo devo: heterochrony
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develop change in timing of events leading to change in size/shape ; organs mature in repsect at early or later stage
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evo devo: paedomorphiss
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retention by org of juvenile or larval traits into later life
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genetic mech of change: homoetic genes
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genes that detremine which parts of bopdy from wich body parts
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sympartic conditions
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must be in contact, gene flow is readily availabe
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