Chapter 23 & 24 Flashcards

1
Q

Darwin and Wallace proposed ___

A

evolution by natural selection

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2
Q

some of the variations among individuals are ___, they are passed on from parents to their offspring

A

heritable

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3
Q

there is ___ between individuals within a species for recourses like food, mates, and places to live.

A

competiton

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4
Q

many genes exist in 2 or more forms called ___

A

alleles

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5
Q

alleles code for slightly different versions of the same ___

A

protein

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6
Q

the differences in ___ cause the variation you see within a species

A

alleles

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7
Q

breeding plants and animals for desirable characteristics

A

artificial selection

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8
Q

artificial selection is also called ___

A

selective breeding

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9
Q

2 examples of natural selection

A
  • evolution of antibiotic resistance in bacteria

- insecticide resistants in insects

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10
Q

evidence for evolution (5)

A
  • fossil evidence
  • anatomical evidence
  • biogeographical evidence
  • biochemical evidence
  • embryological evidence
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11
Q

structures that were inherited from a common ancestor

A

homologous structures

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12
Q

stunted wings on an ostrich or the remnants of a pelvis in some whales and snakes are examples of ___

A

vestigial structures

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13
Q

the study of the distribution of plants and animals

A

biogeography

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14
Q

___ and ___ can be examined to determine how closely related species are

A

DNA

proteins

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15
Q

two or more genes derived from common ancestors are called ___

A

homologous genes

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16
Q

homologous genes in different species are called ___. they indicate the species share a common ancestor.

A

orthologs

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17
Q

gene transfer between species, such as from a bacteria to a eukaryotes or from a Neanderthal to a modern human.

A

horizontal gene transfer

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18
Q

development of a species

A

ontogeny

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19
Q

evolutionary history of a species

20
Q

a local group of individuals of the same species

A

population

21
Q

populations are ___, they can change from generation to generation.

22
Q

all of the alleles for every gene in a population

23
Q

most genes are ___; they exist as two or more alleles

A

polymorphic

24
Q

the number of copies of a specific allele in a population divided by the total number of alleles for the specific genes in a population

A

allele frequency

25
the number of individuals with a particular genotype in a population divided by the total number of individuals in a population
genotype frequency
26
describes the relationship between allele and genotype frequencies in a population that is not evolving. p^2+2pq+q^2=1 -equation for a gene that exists in 2 alleles
hardy-weinberg equation
27
conditions for hardy-weinberg (6)
- no new mutations - no natural selection - no advantage for any one allele - large population - no migration - random mating
28
changes in the gene pool from generation to generation
microevolution
29
___ involves introduction of new genetic variation and evolutionary mechanisms that alter prevalence of genotypes
microevolution
30
extreme phenotypes are favored
directional selection
31
favors intermediate phenotypes
stabilizing selection
32
favors two or more different phenotypes
diversifying selection
33
two or more alleles are kept in balance
balancing selection
34
certain individuals possess certain traits that make them more successful in reproduction
sexual selection
35
the different appearance of the 2 sexes resulting from different secondary sex characteristics
sexual dimorphism
36
one sex competing amongst themselves from mating opportunities
intrasexual selection
37
one sex choosing mates based on desirable characteristics
intersexual election (mate choice)
38
changes in allele frequencies due to chance
genetic drift (this is not natural selection)
39
genetic drift includes the ___ and the ___
- bottleneck effect | - founder effect
40
a large population may be severely reduced in size by a disaster, the remaining individuals are unlikely to have the genetic diversity of the original large population
the bottleneck effect
41
genetic drift in a new isolated colony
the founder effect
42
changes in genes that do not effect reproductive success | -promoted by genetic drift
neutral variation
43
the flow of genes between populations by migrating individuals
the gene flow
44
inbreeding produces less fit homozygotes reducing a populations' reproductive success
inbreeding depression
45
mutations give rise to new alleles- most are ___ (do not help survival) but some re useful and are favored by natural selection.
deleterious