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how do allele frequencies change?
genetic drift
gene flow
nonrandom mating
mutation
natural selection
genectic drift
any change in allele frequencies
caused by chance
:
effects small pop. more dramticaly
founder effect
when small groups of a larger population settles in a separete location
bottleneck effect
when a population declines to a very low number and rapidly rebounds
gene flow
movement of genes in and out of population : cuases more genectic variation
immigration
emmigration
hardy-weinberg equation
p
recessive
q
dominant
allele frequency
number of times each allele trait shows in a population
allopatric speciation
physical barrier splits population into seperate populations
symparic speciation
species evolve ino new species
without a physical barrier
adaptive radiation
species diverge into many species under a
short timespan
extreme form of divergent evolution
types of coevolution
mutualism
predator and prey
parasite and hos
gradualism
slow evolution over a long period of time
small gradual changes in population
punctuated equilibrium
rapid spurts of genectic change
species evolve quickly
possible large changes
three types of natural selection
stabilizing
directional
disruptive
stabilizing selection
eliminates extreme trait expressions
averages the population
directional selecion
increases selection of ONE extreme
disruptive selection
selects for BOTH extremes
sexual selection
choosing of traits that lead to mating success
repuductive isolation
two species that are not able to successfully mate
prezygote isolation
able to mate but unable to fertilize
postzygotic isolation
fertilization has occured
but offspring cannot develope or reproduce
speciation
process of one parental species becoming seperate species
Darwin embarked on a voyage around the world aboard _____ that went from ____ to ____
HMS beagle
1831- 1836
darwin knew about a process called ______ ______ used on dogs, pigeons, and agriculture.
selective breeding
process which humans slectively breed organism for a specific trait
artificial selection
4 principles of natural selection
variation
heritability
overproduction
repoductive advantage
evidence for evolution
fossil record
comparitive morphology
comparive embryology
comparitive biochemistry
Author
tanyalequang
ID
143672
Card Set
History of Life terms
Description
sem 1
Updated
3/25/2012, 7:20:19 PM
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