unit 7 part 1 (7.1-7.5) Flashcards

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1
Q

evolution

A

change in the genetic makeup of a population over time

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2
Q

natural selection

A

process that organisms, having adaptions suited for a particular environment, have a greater chance of survival and reproduction, passing the adaptations to subsequent generations

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3
Q

competition

A

organisms struggle with other organisms to get limited resources like space, food, mates, nutrients, light

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4
Q

variation

A

genetic differences among organisms (mutations and sexual reproduction increase variation)

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5
Q

adaptations

A

traits that provide an advantage in a particular environment, increase chances of survival and reproduction

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6
Q

fitness

A

ability of an organism to survive and produce offspring

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7
Q

reproductive success

A

production of offspring

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8
Q

heritability

A

ability to pass on adaptations to successive generations

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9
Q

what contributes to fitness?

A

heritability and reproductive success

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10
Q

biotic vs abiotic

A

biotic is living things and abiotic is nonliving components

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11
Q

populations are less likely to evolve in a __ environment

A

stable

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12
Q

use and disuse

A

parts of the body that are used frequently become larger and stronger while others deteriorate

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13
Q

descent with modification

A

unity of life is attributed to decent of all organisms from one ancestor that had modifications along the way

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14
Q

artificial selection

A

humans modify other species by selectively breeding individuals for desired traits (dog breeding)

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15
Q

key thing rizz wanted us to know

A

individuals do not evolve, populations evolve over time

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16
Q

homology

A

similar characteristics that function differently

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17
Q

vestigal structures

A

remains of features that served a function in the organism’s ancestors.

18
Q

convergent evolution

A

similar environmental conditions can select for similar traits in different populations or different species over time

19
Q

genetic variation

A

describes genotypic and phenotypic differences between individuals in a population

20
Q

selective pressure

A

any biotic or abiotic factors influencing survivability

21
Q

analougous structure

A

similar traits observedin distantly related or unrelated species

22
Q

darwins two observations

A

1) variations (same pop, diff traits)
2) more offspring than environment can support (everyone is fighting for survival because stuff is limited)

23
Q

darwins two inferences

A

1) survived have offspring, differential reproductive success
2) individual organisms do not evolve, adaptations are passe down

24
Q

order of natural selection

A

mutations -> variations -> selective pressure -> change in population

25
Q

mutations

A

contributes to changes in genetic makeup, creates genetic variation, provides new phenotypes to contribute to evolution

26
Q

genetic drift

A

chance events that cause allele frequencies to fluctuate unpredictibally from one generation to the next (especially in small populations)

27
Q

founder effect

A

few individuals become isolated from a larger population, the smaller group may establish a new population with a gene pool that differs from the source (ex: blown away by storm)

28
Q

bottleneck effect

A

sudden change in environment (fire, flood, etc) that dramatically reduces size of a population (by chance certain allels can over represent themselves)

29
Q

gene flow

A

transfer of alleles into or out of a population due to movement of fertile individuals or their gametes (ex: insects carrying pollen)

30
Q

relative fitness

A

contribution an individual makes to the gene pool of the next generation RELATIVE to the contributions of other individuals

31
Q

directional selection

A

occurs when conditions favor individuals at one extreme of the phenotypic range (shifts in pop frq curve in one direction, common when environment changes or migtation)

32
Q

disruptive selection

A

occurs when conditions favor individuals at both extremes of phenotypic range over intermediate phenotypes

33
Q

stabilizing selection

A

acts against both extremes an favors intermediate varients, reduces variation and maintains status quo of particular phenotypic character

34
Q

rapid repro =

A

increased mistakes!

35
Q

population

A

group of individuals of the same species that live in the same area and produce offspring (breed with eachother)

36
Q

gene pool

A

all copies of every type of allele in all members of the population, the deck of genes that is being continiously reshuffled

37
Q

hardy weinberg principal

A

helps us conclude whether population is evolving

38
Q

hardy weinberg equalibrium

A

frq of alleles and genotypes in a population will remain constant from gen to gen, if ONLY mendelian segregation and recominant alleles are at work

39
Q

5 conditions necessary for hardy equilibrium

A

1) large population (no genetic drift)
2) absence of migration (no gene flow)
3) no net mutation
4) random mating (no sexual selection)
5) absence of natural selection

40
Q

5 causes of allele frequency changes

A

1) population shrink
2) mating (nonrandom)
3) mutation
4) movement (migration)
5) natural selection