Evolution Flashcards

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1
Q

Lamarckian Evoluation

A
  • new organs or changes in existing ones arose b/c of the needs of the organism
  • amount of change was thought to be based on the disuse of the organ
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2
Q

Darwin’s Theory of Natural Selection

A

-pressure in the environment select for the organism most fit to survive and reproduce

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3
Q

Overpopulation

A

more offspring are produced than can survive

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4
Q

Variations

A

offspring naturally show differences in their characteristics compared to those of their parents

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5
Q

Competition

A

the developing population must compete for the necessities of life

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6
Q

Natural Selection

A

species have variations that give them advantage over other members of the species

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7
Q

Inheritance of the Variations

A

individuals that strive to adulthood reproduce and transmit favorable genes to offspring (genes will dominate gene pool)

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8
Q

Evolution of New Species

A

accumulation of favorable changes eventually results in such significant changes in the gene pool that we can say new species has evolved

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9
Q

Speciation

A

the evoluation of new species, which are groups of individuals that can interbreed freely with each other, but not with members of other species

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10
Q

demes

A

local populations formed within a species. if demes, become isolated, speciation may occur

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11
Q

phylogeny

A

a branching tree on which the common ancestor is found at the trunk and the modern species are found at the tips of the branches

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12
Q

convergent evolution

A

groups among the branches often develop similar traits

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13
Q

Parallel Evoluation

A

similar to convergent evolution but occurs when a more recent ancestor can be identified

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14
Q

Divergent Evolution

A

occurs when species with a shared ancestor develop differing traits due to dissimilarities between their environments

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15
Q

Adaptive Radiation

A

the emergence of a number of lineages from a single ancestral species

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16
Q

Population

A

includes all members of a particular species inhabiting a given location

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17
Q

Gene Pool

A

the sum total of all the alleles for any given trait in the population

18
Q

Gene Frequency

A

the decimal fraction representing the presence of an allele for all members of a population that have the particular gene

19
Q

The Hardy-Weinberg Principle

A
  • evolution can be viewed as a result of changing gene frequencies within a population
  • when gene frequencies of a population are not changing, the gene pool is stable and the population is not evolving.
  • only true in an IDEAL population: the pop is very large, no mutations affect the gene pool, mating between individuals in the population is random, there is no net migration of individuals into or out of the population, the genes in the population are equally successful @ reproducing
20
Q

Microevolution

A
  • real populations have unstable gene pool and migrating populations
  • agents of microevolution: natural selection, mutation, assortive mating, genetic drift, and gene flow
21
Q

Natural Selection

A

genotypes with favorable variations are selected through natural selection

22
Q

Mutation

A

gene mutations change allele frequencies in a population, shifting gene equilibria by introducing additional alleles

23
Q

Assortive Mating

A

mates are chosen according to criteria such as phenotype and proximity, the relative genotype ratios will be affected and will depart from the predictions of the Hardy-Weinberg equilibrium

24
Q

Genetic Drift

A

refers to changes in the composition of the gene pool due to chance (also called founder effect)

25
Q

Gene Flow

A

migration of individuals between populations will result in a loss or gain of genes

26
Q

Fossil Record

A

direct evidence of evolutionary change

27
Q

Types of Fossils

A

can be found in rock, tar pits, ice, and amber

28
Q

Petrification

A

the process by which minerals replace the cells of an organism

29
Q

Imprints

A

impressions left by an organism

30
Q

Molds

A

form hollow spaces in rocks as the organisms within decay

31
Q

Casts

A

formed by the minerals deposited in molds

32
Q

Homologous Structures

A

have the same anatomical features and evolutionary origins. Although anatomical features may be similar, their functions may not be

33
Q

Analogous Structures

A

have similar functions but may have different evolutionary origins and entirely different patters of development

34
Q

Comparative Embryology

A

stages of development of the embryo resemble the stages in an organism’s evolutionary history

35
Q

Comparative Biochemistry (Physiology)

A

most organisms demonstrate the same needs and metabolic processes

36
Q

Vestigial Structures

A

have no known current function but apparently had some ancestral function

37
Q

Geographic Barriers

A

species multiplication is generally accompanied by migration to lessen intraspecific competition

38
Q

The Heterotroph Hypothesis

A

first forms of life lacked the ability to synthesize their own nutrients. these organisms depended upon outside sources for food

39
Q

Evidence of Organic Synthesis

A

Stanley L. Miller stet out to demonstrate that the application of UV radiation, heat, or a combination of these to a mixture of methane, hydrogen, ammonia, and water would result in the formation of complex organic compounds

40
Q

Formation of Primitive Cells

A

coacertive droplets (a duster of colloidal molecules surrounded by a shell of water) may have formed the first primitive cells