Evolutionary History Flashcards

(38 cards)

1
Q

Definition of phylogenetic classification

A

Grouping organisms together to reflect evolutionary history, closely related organisms grouped together. Groups have a more recent common ancestor so will share physical properties

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2
Q

Phylogenetic tree

A

Branch points represent common ancestors of organisms in branches above

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3
Q

Taxa are..

A

Levels of classification

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4
Q

Classification order

A
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
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5
Q

Largest taxon?

A

Domain

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6
Q

3 types of Domain

A

Eubacteria
Archaea
Eukaryota

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7
Q

Eubacteria

A

Prokaryotes, familiar bacteria like e.coli and salmonella

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8
Q

Archaea

A

Prokaryotes, bacteria with unusual metabolisms, ‘extremophiles’

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9
Q

Eukaryota

A

Eukaryotes like plantae, fungi, animalia, protoctista

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10
Q

5 types of Kingdom

A
Prokaryota
Protoctista
Animalia
Plantae
Fungi
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11
Q

Prokaryota

A

Bacteria/Cyanobacteria, microscopic, single called organisms with no membrane bound organelles , prokaryotes with murein/peptidoglycan cell walls

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12
Q

Protoctista

A

Eukaryotes, unicellular, can be multicellular but with no tissue differentiation e.g amoeba, algae, slime moulds

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13
Q

Fungi

A

Eukaryotes with chitin cell walls, heterotrophic, reproduce using spores

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14
Q

Plantae

A

Autotrophic, multicellular eukaryotes with cellulose cell walls, photosynthetic (e.g chloroplasts contain chlorophyll)

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15
Q

Animalia

A

Heterotrophic, multicellular eukaryotes with no cell walls, nervous coordination

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16
Q

Autotrophic

A

Take simple inorganic molecules and convert into complex organic molecules to use as an energy source

17
Q

Heterotrophic

A

Require ready made complex organic molecules to use as food/energy source

18
Q

Homologous structures

A

Similar arrangement of component parts and similar developmental structure but different functions
(Same basic structure, different function)
Shows existence of common ancestry

19
Q

Analogous structures

A

Corresponding function but different developmental origin
(Same function, different structure)
Shows no evidence for common ancestor

20
Q

Convergent evolution

A

Unrelated species evolve similar features to overcome similar problems

21
Q

DNA base sequences

A

Evolution, DNA base sequence changes in species, considered a different species, closely related species have similar DNA base sequences

22
Q

DNA hybridisation

A

DNA extracted and cut into fragments
Fragments from 2 species mixed, where there are complimentary base pairs they hybridise together

Heat to 95 (hydrogen bonds break)
Combine strands
Cool down and hybrid DNA forms
Heat up, will break at less than 95 as fewer hydrogen bonds to break (DNA strands won’t have identical base sequences)

23
Q

Amino acid sequence

A

Determined by DNA base sequence
Similarity of proteins shows how closely related they are
Can produce evolutionary tree

Count amount of amino acid sequences in common, most in common=most closely related so have most common ancestor

24
Q

Immunology

A

Antigens of one species mix with antibodies of another forming a precipitate
More they react, more precipitate made, more closely related

25
Species definition (reproductive definition)
Organisms are in same species if they can interbreed and produce fertile offspring
26
Taxonomy definition and what it allows
Identification & naming of organism allows description and discovery of biodiversity, investigate evolutionary relationships and classifications to reflect them
27
Why is binomial system used?
Latin = universal language | 2 names= Genus species [must be underlined] (name is unique and specific)
28
Biodiversity
Number of species and number of individuals of each species in a given area
29
Simpsons index of biodiversity
S = 1 - sigma n(n-1) divided by N(N-1) ``` n = number of individuals N = number of organisms sampled ```
30
'Gene pool'
All genes and alleles present in a population
31
Polymorphism
Many different phenotype a in population e.g blood types
32
98% alleles recessive compared to 50% recessive
Lower biodiversity in 98%
33
Evolution
Process by which new species formed from pre existing species over long periods of time
34
Natural selection stages
``` Mutation Variation Competitive advantage Survival of the fittest Reproduction Pass advantageous gene to offspring ```
35
Who has different opinion to missing links and creation?
Eldridge and Gould
36
Anatomical traits
E.g. Sharks, Dolphins, penguins have streamlined bodies to catch food/ escape predators Some plants have nectar/honey guides on flowers to attract more pollinators
37
Physiological traits
Mammals and birds endothermic Polar bears however reset body temp hibernating so as not to waste energy Leaves fall off in autumn to reduce water loss
38
Behavioural traits
Plants flower in spring when pollinating insects emerge | Mating rituals