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7.4
7.4
20
Biology
1st Grade
01/22/2011

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Term
what is speciation?
Definition
origin of new species, the focal point of evolutionary theory and the appearance of new species source of biological diversity
Term
what is speciation?
Definition
origin of new species, the focal point of evolutionary theory and the
Term
what is macroevolution?
Definition
evolutionary changes higher than the species level, deals with the appearance of evolutionary novelties, defines higher taxonomic groups
Term
what is macroevolution?
Definition
evolutionary changes higher than the species level, deals with the
Term
what is anagenesis?
Definition
phyletic evolution, 1 species gradually becomes another
Term
what is cladogenesis?
Definition
branching evolution, 1 species becomes 2 or 3 species, increases number of species and promotes biological diversity
Term
what are the two prezygotic reproductive barriers?
Definition
impede mating, prevent fertilization
Term
what are the five prezygotice isolations?
Definition
habitat isolation, behavorial isolation, temporal isolation, mechanical isolation and gametic isolation
Term
describe habitat isolation
Definition
species cant or dont get together
Term
describe temporal isolation
Definition
different mating periods of time
Term
describe behavorial isolation
Definition
rituals performed to attract
Term
describe mechanical isolation
Definition
different anatomy, color, shape, lacking abilities
Term
describe gametic isolation
Definition
gametes fail to fuse,
Term
what is reduced hybrid viability?
Definition
zygote fails to develop or reach sexual maturity
Term
what is reduced hybrid fertility?
Definition
the hybrid is sterile
Term
what is hybrid break down?
Definition
hybrid produces offspring but offspring not viable or fertile
Term
what is allopatric speciation?
Definition
gene flow interrupted by geographic barrier
Term
what is sympatric speciation?
Definition
gene flow interrupted without geographical barrier, subpopulations are fixed on resources not used by parental populations, sexual selection in polymorphic population
Term
describe gradualism as a tempo of speciation
Definition
one species gradually evolves into new species, represents microevolution, big changes occur through accumatation of small changes
Term
what is punctuated equilibruim?
Definition
long periods of stasis punctuated by episodes of speciation. species develop in spurts of rapid NOT slow & gradual change
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