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Biology > Evolution > Flashcards

Evolution Flashcards

1
Q

What did Charles Darwin do?

A

He wrote the Origin of the Species by Natural Selection; which explained how modern organisms evolved over long periods of time from common ancestors

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2
Q

how did meat eating birds evolve to not compete?

A

Evolved to have different characteristics for different niches

owls: crepuscular to nocturnal (dusk and dawn to night)
vultures: scavenged the kills
hawks: stayed diurnal (day)

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3
Q

Different animals with similar characteristics inhabit___

A

similar habitats around the world.

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4
Q

Evolution

A

the process of change over time

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5
Q

two causes of evolution

A

Natural selection and artificial selection

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6
Q

Natural selection

A

organisms that have the best characteristics to survive in an environment will live long enough to pass these superior alleles to the offspring and future generations

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7
Q

artificial selection

A

organism that have the traits that humans want are bred together to give the offspring the desired alleles to pass on to future generations

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8
Q

what did Hutton and Lyell discover that influenced Darwin’s theory?

A

The Earth must be millions of years old for the geological process to have time to shape it as we see it today

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9
Q

what did Malthus discover that influenced Darwin’s theory?

A

predicted that human overpopulation would experience war (for resources), famine, and disease. After deaths, the population size would be manageable again. (just like animals)

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10
Q

what did Lamarck discover that influenced Darwin’s theory?

A

proposed that organisms evolved by acquired traits. What happens to an individual will change its characteristics and this will be passed on to off spring (giraffe necks). this was WRONG trump voice

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11
Q

what did Wallace discover that influenced Darwin to publish his theory?

A

proposes evolution by natural selection. encouraged and recognized by Darwin.

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12
Q

The struggle for existence

A

members of a population must compete for limited resources (minerals, air, water, shelter). only a limited number can win.

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13
Q

What do the “winners” of the struggle for existence have?

A

had the best variations of a characteristic which made them superior in getting resources. they were the fittest

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14
Q

Fitness

A

how well an organism can survive and reproduce so the alleles for the survivor characteristic are passed on

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15
Q

in a population do all characteristics have a population?

A

yes. some of these variants are better suited to life in that environment. these will be passed on

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16
Q

adaptation

A

any heritable (passed on) characteristic that increases an organisms chance to survive and reproduce in a given environment (becomes most frequent allele, even if recessive)

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17
Q

survival of the fittest

A

the fact that the organisms with the adaptations Best suited for survival for life and reproduction will have the greatest rate of survival

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18
Q

when will natural selection happen

A

whenever more organisms are born then can survive. the less suited to obtain resources will die

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19
Q

Principle of common descent

A

suggests that all species come from common ancestors that evolved over time through natural selection as the environments changed around the world

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20
Q

fossils

A

preserved remains of organisms

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21
Q

descent with modification

A

natural selection changed more and more of the characteristics in a population until the members didn’t look like the ancestors, they created a new species.

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22
Q

biogeography

A

tells us where organisms live now and where they lived in the past. patterns suggest environmental factors for evolution

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23
Q

h0m0logous structures

A

non-similar organisms in related animals. these animals were from a common ancestor population whose members adapted to different habitats. these structures are now used in different ways

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24
Q

divergent evolution

A

results in homologous organs. the original population spreads out into various habitats that put different environmental selection pressures on the organisms. as organisms adapt to new/different environments their bodies change from the original populations and each offshoot population. (body similar on inside)

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25
Q

analogous structures

A

body parts that share common function but not structure. the animals are not closely related. don’t share many characteristics

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26
Q

convergent evolution

A

results in analogous structures. organisms not closely related have similar body parts because they are dealing with the same environmental pressures. (body similar on outside)

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27
Q

Vestigial structures

A

body parts inherited by ancestors but they have lost most or all of its original function. it didn’t matter if they were there or not. variants with or with out them were just as fit.
ex: wiggling ears, appendix, tail bone

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28
Q

embryological evidence for evolution

A

exists in the same patterns of embryo development by the HOX genes

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29
Q

molecular evidence for evolution

A

exists in the common genetic code for shared genes, particularly those for protein synthesis and cytochrome C (all organisms have just in different orders) used in respiration

30
Q

what are the 7 kingdoms

A

Animalia, plants, fungus, Protista, Eubacteria, Archeabacteria

31
Q

KPCOFGS

A

kingdom, phylum, class, order, family, genius, species

32
Q

Do environmental pressures act on the genotype or phenotype?

A

Natural selection; environmental pressures (amount of water, food, shelter, temperature, light, weather) act on expressed traits in the phenotype, not on the alleles

33
Q

gene pool

A

all the genes of the population. it will reflect the allele frequency

34
Q

allele frequency

A

how many times an allele occurs in the gene pool compared to all the other alleles for the same gene in that gene pool. (how often)

35
Q

Def of evolution in genetics

A

evolution changes the frequency that an allele appears in a population
as the organisms adapts and either more or less organisms inherit that form of the trait

36
Q

are mutations always bad?

A

no. they can be good bad or neutral. the good ones will be passed more frequently and those organisms are the fittest

37
Q

how is sexual reproduction good ;-)

A

gives the best advantage in creating new variants.

some variants have the fittest set of characteristics to survive

38
Q

what are 3 ways sexual reproduction creates variations

A

gene shuffling
crossing over
and in bacteria only; lateral gene transfer

39
Q

gene shuffling

A

chromosomes move independently during meiosis

40
Q

crossing over

A

creates new combinations

41
Q

lateral gene transfer

A

bacteria can combine DNA from plasmids and combine genes for various functions to make a bacteria with “new” capabilities than ever existed

42
Q

Congregation tube

A

bacteria connect and trade genes through tube during Lateral gene transfer

43
Q

3 Natural selection patterns

A

directional selection
stabilizing selection
disruptive selection

44
Q

Directional selection

A

Selects for one extreme or the other. majority of the population shifts towards one extreme or side. frequency of allele becomes more numerous

45
Q

stabilizing selection

A

most are average, moves towards middle. extremes of trait lessen greatly or go extinct. Most common pattern. Selects for average and against extremes

46
Q

disruptive selection

A

“interrupts” flow, average is disruptive. leans towards traits that are at extremes. little variation between two extremes. selects for extremes and against average

47
Q

genetic drift

A

Totally by chance. Not natural selection. certain alleles are passed on by chance. Original generation is called “founder effect” because they carry only certain alleles by chance.

48
Q

genetic equilibrium

A

the allele frequency in a population stops changing with time. stops evolving. it is perfectly suited to the environment as it is

49
Q

Hardy- Weinberg principle

A

an allele frequency in a population should remain constant unless something causes it to change. no evolution unless environment changes.

50
Q

what are the 5 things that can disturb equilibrium (cause evolution)

A

nonrandom mating, small population size, immigration or emigration, mutation, natural selection

51
Q

how does nonrandom mating cause evolution

A

mates are chosen on the superior quality of a trait. sexual selection. Ex; peacocks, bears, lizards from Galapagos

52
Q

how does small population size cause evolution

A

if genetic drift occurs more easily on a small population and has a more dramatic effect on a small population. Ex; flooded beetles story

53
Q

how does Immigration or emigration cause evolution

A

changes gene pool by gene flow. individuals entering may introduce alleles and individuals leaving remove alleles

54
Q

how does mutation cause evolution

A

introduce new alleles into a gene pool causing a change in gene frequency

55
Q

how does natural selection cause evolution

A

if different genotypes result in different phenotypes with different fitness, certain alleles will be selected for and equilibrium will be disrupted

56
Q

speciation

A

the process of forming a new species. original population splits into two and becomes separated. they each evolve to their own new environment until they are so different they can no longer interbreed

57
Q

behavioral isolation

A

behaviors no longer communicate. Ex; courtship/ mating calls

58
Q

Geographic isolation

A

split populations cannot interbreed so as physical differences build up, two species are created

59
Q

Temporal isolation

A

life activities occur at different times of day or season. the species can no longer interbreed because of timing

60
Q

fossil

A

preserved evidence of ancient life on earth. can be mummified (dry or frozen), in amber, rock, molds.
(best are in sedimentary rocks)

61
Q

relative dating

A

compare them to which is above or below them in rock layers. more recent =closer to surface. NO YEARS!!

62
Q

index fossils

A

are found in many areas in the same rock layer. they are standard for comparison in relative dating

63
Q

radiometric/radioactive dating

A

compares the amount of radioactive element left in a dead organism to the amount that would have been in it when it was alive. this ratio gives age. isotopes decay

64
Q

half life

A

the amount of time it takes for half the amount of radioactive sample to disintegrate to harmless form
Carbon14 -> Carbon12
50% = 5770 years
75% =11540 years etc.

65
Q

2 types of speed of evolution

A

gradualism and punctuated equilibrium

66
Q

Gradualism

A

slow and steady evolution as natural selection produces small changes in allele frequencies thus changes in phenotypes

67
Q

punctuated equilibrium

A

no change in gene pool for many generations then suddenly a brief period of rapid environmental change so rapid evolution. no intermediate fossils so its hella confusing

68
Q

Margulis Endosymbiont Hypothesis

A

Large prokaryotes engulfed small ones. if the small one provided a service, it was not destroyed. like agario

69
Q

evidence for Endosymbiont Hypothesis 1

A

Chloroplast and mitochondria have DNA more similar to bacterial DNA then the DNA found in the nucleus of the eukaryotic cell

70
Q

evidence for Endosymbiont Hypothesis 2

A

chloroplasts and mitochondria have double membranes with the inner membrane resembling bacterial cells and the outer membrane resembling the cell of which they are a part

71
Q

evidence for Endosymbiont Hypothesis 3

A

when the eukaryotic cell divides by mitosis, the organelles (chloroplast and mitochondria) divide by binary fission like bacteria- the prokaryote

Biology (16 decks)

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