1/24/17 lecture: adaptive evolution Flashcards Preview

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Flashcards in 1/24/17 lecture: adaptive evolution Deck (21):
1

theory

broad framework, lots of data, supported, well established
accept or reject beleif

2

evolution

outcome of some force, change over time - change in genetic composition (measured as allele/geneotypefrequencies) of a population

3

genetic composition

traits - ie how fast cheetahs run

4

natural selection

one force of four, the only one that leads to adaptation
differential contribution of offspring to next generation by altertanive genetic types, is driven by differential reproducitve success, happens naturally

5

diferential reproduction

reproducing - some reproduce at different rates, some reproduce faster than others

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darwin wrote

origin of speies 1859

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thesis of darwin

descent with modification, natural selection

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descent with modification

organisms evolve and they evolve from pre exisitng orgnaisms, explains both the unity and diversity of life

9

natural selection

this is the mechanism of evolutionary change - 1. if there are heritable phenotypic variations among individuals in a population and 2. these differences lead to differences among individuals in terms of how many offspring each type produces (differential reproductive success) then 3. there will necessarily be an increase in the frequency of the type that reproduces better (evolution by way of natural selection)

10

outcome of natural selection depends on

differential reproduction and the environemnet surrounding

11

outcome of natural selection depends on

differential reproduction and the environemnet surrounding

12

importance of tournament of kitchen utensils

stimulation of nautral selection -heretibale variance bc genes evolve

13

charles darwin peacock issue

how do peackkcok feathers help surivival? how did it evolve? doesn't it go against natural selection and evolution?

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ultimate goal is

reproductive veiw/output, peacocks can suveve and reproudce mrewith elaborate feathers - color size, feamales choose males based on this

15

sexual selection

type of natural seleciton occurs wen idnividuals compete for mates - proposed to account for evolution of traits appear to be maladaptive bc lessen surivval

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natural selection on traits affecting reproduction

1. female choice 2. male to male competition

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heritability

proportion of phenotypic variation in a population due to genetic variation between individuals

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fitness

how mnay copies of individual genes in next generation

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male to male comeptiton components

phsyical dominance, attrativeenss, body size, sexual diimorphism

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on peacocks eye spots gneenrally means

more eyes psots means more copuulations

21

honest signaling

showing they are quality to females, assumed females dont purpose choose - unconcious

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