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Biology > 4.2.2 Classification and Evolution > Flashcards

4.2.2 Classification and Evolution Flashcards

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1
Q

what is classification

A

the process by which living organisms are sorted into groups based on similarities and differences between species

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2
Q

what is taxonomy

A

the study and practice of naming and classifying species and groups of species within the hierarchal classification scheme

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3
Q

what are the taxonomic groups

A

kingdom, phylum, class, order, family, genus, species

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4
Q

describe the kingdom in size

A

the biggest and broadest taxonomic group

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5
Q

describe species in size

A

the smallest and most specific classification

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6
Q

what is the hierarchal classification also known as

A

linnaean classification

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7
Q

who was carl linnaeus

A

the first person to propose the classification system

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8
Q

what is the most recent classification added

A

domain

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9
Q

where is domain placed in the taxonomic group order

A

at the top

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10
Q

why do scientists classify organisms

A
  • to identify species
  • to predict charactersistics
  • find evolutionary links
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11
Q

what are the three domains

A
  • archea
  • bacteria
    -eukarya
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12
Q

what is the definition of a species

A

a group of organisms that are able to reproduce to produce fertile offspring

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13
Q

give an example of a species

A

donkeys can reproduce with other donkeys, but when a horse breeds with a donkey the offspring produced is infertile

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14
Q

why is a horse and donkey bred make the offspring infertile

A

because their cells contain an odd number of chromosomes
so meiosis and gamete production cannot take place correctly

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15
Q

why is the system of giving names due to a charcterstic not a sufficient method?

A
  1. same organisms may have a complete different common name in different parts of one country
  2. different common names are used in different countries
  3. translation of languages/dialect may give different names
  4. same common name could be used for a different species in another part of the world
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16
Q

what is the binomial nomenclature

A

a system created by carl linnaeus to give animals names to ensure aniamls of the world are discussing the same organism

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17
Q

describe the naming steps of the binomal menclature system

A
  • first word indicates the organisms genus (generic name , like a surname)
  • second word is the organisms species (specific name)
    -no two species have the same generic and specific name
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18
Q

how would you represent an organisms scientific name

A

printed - italics
handwritten - underlined
capital letter for beginning of genus name

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19
Q

give an example of an organisms scientific name

A

Canis familiaris (dog)

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20
Q

what are the 5 kingdoms

A

prokaryote, protoctista, fungi, plantae, animalia

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21
Q

what did early classification rely on?

A

observable features only to place organisms into groups such as appearance and anatomy

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22
Q

what did Aristole classed all things as

A

plants and animals (live and move in water, live and move on land, move through air)

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23
Q

what lead to the 5 kingdom system

A

when microscopes developed overtime and more organisms could be studied in detail

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24
Q

what is a prokaryote general features

A
  • unicelluar
  • no nucleus or membrane - bound organelles
  • no visible feeding mechanism, nutrients are absorbed through the cell wall or produced internally
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25
Q

what are the general features of protoctista

A
  • mainly unicellular
  • has a nucleus and other membrane-bound organelles
  • some have chloroplasts
  • some sessile, but others move by cillia, flagella, or amoeboid mechanisms
  • nutrients are aquired by photosynthesis (autotrophic and heterotrophic feeders)
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26
Q

what are the general features of fungi

A
  • unicellular or multicellular
  • a nucleus and other membrane-bound organelles and a cell wall which is composed chitin
  • no chloroplasts or chlorophyll
  • no mechanisms for locomotion
  • most have a body for mycelium made of threads or hyphae
  • nutrients are aquired by absorption - mainly from decaying material, also saprophytic feeders, some are parasitic
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27
Q

what are the general features of plantae

A
  • multicellular
  • a nucleus and other membrane-bound organelles including chloroplasts and a cell wall mainly composed of cellulose
  • all contain chlorophyll
  • autotrophic
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28
Q

what are the general features of animalia

A
  • multicellular
  • a nucleus and membrane-bound organelles
    heterotrophic
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29
Q

who created the three domain system

A

carl woese in 1990

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30
Q

why did he create the three domain system

A

as scientists started to discover more about biology and biochemistry, which led to discovery that there were some majot differences within the prokaryote kingdom

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31
Q

what are the three domains?

A

bacteria, archaea, eukarya

32
Q

describe eukarya

A

they have 80s ribosomes - RNA polymerase contains 12 proteins and includes the kingdoms: protists, fungi, plantae, animalia

33
Q

describe archaea

A

they have 70s ribosomes - RNA polymerase of different organisms contains between 8 and 10 proteins and is very similar to eukaryotic ribosome

34
Q

describe bacteria

A

they have 70s ribosomes - RNA polymerase contains 5 proteins

35
Q

what are the two kingdoms that prokaryotes are divided into

A

archaeabacteria and eubacteria

36
Q

describe archaeabacteria

A

(ancient bacteria) can live in extreme environments, example: methanogens live in anaerobic environments such as sewage treatment plants and make methane

37
Q

describe eubacteria

A

(true bacteria) found in all environments, and most common bacteria

38
Q

what is phylogeny

A

the study of evolutionary relationships between organisms

39
Q

what are the advantages of phylogeny

A
  • it can be without referring to the Linnean classification
  • it produces continuous tree whereas classification requires discrete taxonomical groups
  • it is not as misleading as the hierarchal classification of the linnean system
40
Q

what does biological species concept

A

the ability of two individuals to successfully produce viable fertile offspring

41
Q

what is morphological species concept

A

whether individuals look similar

42
Q

what is phylogenetic species concept

A

how closely related individuals are evolutionarily

43
Q

what is ecological species concept

A

whether the individual use or can use the same set of biological resources

44
Q

what is phylogenetic species concept

A

concept of a species as an irreducible group whose members are descended from a common ancestor and who all possess a combination of certain defining or derived traits

45
Q

what is a phylogenetic tree

A

a diagram used to represent the evolutionary relationships between organisms, they are branched diagrams

46
Q

who made the natural selection theory

A

charles darwin

47
Q

where was darwin’s ideas developed

A

around the world including the galapagos islands

48
Q

what was the 4 observations darwin made

A
  • offspring generally appear similar to their parents
  • no 2 individuals were identical
  • organisms have the ability to produce large numbers of offspring
  • population in nature tend to remain fairly stable in size
49
Q

how did wallace contribute to darwin’s ideas

A
  • some organisms had advantageous adpatations evolved by natural selection
  • geographical boundaries often marked species boundaries
    -most of the individuals found in a habitat were the best fitted for that environment
50
Q

what are the evidence for evolution

A

fossil evidence
comparative anatomy
comparative biochemistry

51
Q

what is a fossil

A

mineralised or preserved remains of an animal, plant or microorganismh

52
Q

how are fossils made

A

animal/plants -> organisms becomes buried under sediments -> high temp and pressure turns sediment into stone -> the remains dissolve and leave behind a space
-> minerals crystallise in the space and forms a cast

53
Q

are complex organisms found in recent rock layers or old

A

recent

54
Q

how can scientists show how closely related organisms have evolved from same ancestor

A

by studying similarities in the anatomy of fossil organisms

55
Q

what is the homologous structure

A

a structure that appears superficially different in different organisms but has the same underlying structure

55
Q

describe comparative anatomy

A

bones that are used for very different functions but have the same structure, which suggest they have all evolved from the same common ancestoras the vertebrate limbs have all evolved from the structureh

56
Q

what does comparative anatomy provide evidence for

A

divergent evolution and would most likely be due to migration or loss of habitat

57
Q

what is comparartive biochemistry

A

the study of similarities and differences in the proteins and other molecules that control life processes

58
Q

describe comparative biochemistry

A

some important molecules are highly conserved among species

59
Q

how to discover how closely two species are related

A
  • there are many possible different types of amino acids, but only 20 are used to make proteins
  • the molecule of inhertance in all cellular organisms is DNA
  • the genetic code that specifies an organisms amino acids is basically the same in all organisms
  • ATP is the universal currency for energy in all cells of all organisms
60
Q

molecular evidence

A
  • difference in the sequence of a DNA molecule would be due to mutations as the genetic code is universal and so a particular sequence of DNA codes for the same ssequence of amino acids in both an animal, palnt or bacterium
  • the more similar the sequence in parts of the DNA, more closely related the species
  • more differences in sequence in part of the DNA then the earlier the evolution of the two species and so less closely related they are
61
Q

what is variation

A

the difference between species and the differences within species

62
Q

what is intraspecific variation

A

variation between members of the same species
(used to study natural selection and evolution)

63
Q

what is interspecific variation

A

differences between species (identify different species and to classify them

64
Q

what is continuous variation

A

variation in a feature that shows a range of phenotypes between two extremes with many intermediates

65
Q

what causes variation

A

an organisms genetic
the environment in which the organism lives - this causes environmental variation

66
Q

what is discontinuous variation

A

variation in a feature that has discrete categories without any intermediates

67
Q

how does allele affect variation

A

genes have different versions (alleles) and the individuals in a species population may inherit different alleles of a geneo

68
Q

how does mutatuions affect variation

A

changes to DNA sequence and therefore genes can lead to changes in the protein coded for and this can affect the physical and metabolic charactersitics

69
Q

how does meiosis affect variation

A

formation of gametes and the process of independent assortment and crossing over to mix up the genetic material

70
Q

what are the other two factors that affect variaiton

A

sexual reproduction and chance - random fertilisation as a result of which gametes combine

71
Q

what are combined effects of variation

A
  • not all genes are active at the same time, for example, puberty.
  • changes in the environment can also directly affect which genes are active (melanin production)
72
Q

what is the null hypothesis

A

the hypothesis that states there is no difference between x and y
- null hypothesis is the default, we are pessimistic and assume that there is no relationship, it is the job of your experiment to prove it wrong
- normal hypothesis is called the alternative hypothesis

73
Q

what is the degree of freedom

A

the number of values that could vary, its usually the number of results -1

74
Q

what is standard deviation

A

a measure of the spread of data around a mean

75
Q
A
76
Q

gucci

A

bjbb

Biology (28 decks)

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