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✅Biology AS Unit 2 > 🔺🔥2.1 -Classification And Biodiversity > Flashcards

🔺🔥2.1 -Classification And Biodiversity Flashcards

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1
Q

Define the term phylogenetic

A

Reflecting evolutionary relatedness (grouping)

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2
Q

How do we know that 2 organisms are closely related

A

They have a more recent ancestor with each other than with organisms not in their group

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3
Q

What form of diagram is shown to highlight organism relatedness

A

Phylogenetic tree

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4
Q

Define the term phylogenetic tree

A

A diagram showing decent, with living organisms at the tips of the branches and ancestral species in the branches and trunk, with branch points representing common ancestors. The lengths of branches indicate the time between branch points

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5
Q

Which species exist in a phylogenetic tree?

A

The species at the top of the tree

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6
Q

Where are those extinct species located in a phylogenetic tree

A

They are not in the top row

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7
Q

LEARN STRUCTURE OF THE PHYLOGENETIC TREE

A

LEARN THE STRUCTURE OF THE PHYLOGENETIC TREE OF ALL ORGANISMS

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8
Q

Define taxonomy

A

The identification and naming of organisms

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9
Q

Define classification.

A

Putting items into groups

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10
Q

Define hierarchy

A

A system of ranking in which small groups are nested components of larger groups

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11
Q

Define taxon (pleural=taxa)

A

Nah group within a system of classification

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12
Q

What do bigger taxa contain

A

Smaller taxa with organisms more closely related than organisms outside the taxa

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13
Q

What is the hierarchal order of biological classification.

A

Domain> kingdom> phylum> class> order> family> genus> species

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14
Q

Give an example of a domain, kingdom and phylum

A 
Domain = Eukaryota 
Kingdom = Animalia
Phylum = Chordata
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15
Q

Give an example of class, order and family

A 
Class = Mammalia 
Order = Primates 
Family = Hominidae
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16
Q

Give an example of the human genus and species

A 
Genus = Homo 
Species = sapien

Note the capital letter on Homo and lower case s on sapien

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17
Q

What happens as you move down the hierarchy from domain to species?

A

Organisms in a taxon are more closely related

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18
Q

What happens as you move up the hierarchy from species to domain

A

Members of a taxon are less closely related

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19
Q

What does ‘a taxon is discrete mean’

A

At any level Of classification an organism belongs in one taxon and in no other

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20
Q

State 4 reasons why we need a classification system

A
  • allows us to infer evolutionary relationships (same taxon :: assume closely related)
  • if a new animals discover we can use characteristics (wings and beak) to determine taxon e.g birds
  • easy to communicate
  • conservationists find it more useful to count families than species
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21
Q

What are the 3 domains that every organism would belong under?

A

Eubacteria, Archaea and Eukaryota

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22
Q

Describe eubacteria

A

Familiar bacteria e.g E.coli and salmonella (prokaryotic)

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23
Q

Describe archaea

A

Bacteria which usually have an unusual metabolism e.g generate methane, live in marginal habitats (prokaryotic)

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24
Q

Define Eukaryota

A

Plantae, Animalia, Fungi and Protoctista

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25
Q

What are the 5 kingdoms

A 
Prokaryota 
Protoctista 
Fungi
Plantae 
Animalia
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26
Q

What does extremeophile mean?

A

Organism (archaea and eubacteria) who’s habitats are extreme (temp/pH/salt concentration)

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27
Q

Define phylum

A

A sub group of a kingdom with a distinct body plan e.g the phylum Chordata contains vertebrates

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28
Q

Define class

A

A sub group of a phylum e.g Mammalia for a class within the phylum Chordata

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29
Q

Define order

A

A sub group of a class

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30
Q

Define a family

A

A group within an order e.g flower families

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31
Q

Define a genus

A

A group of similar organisms e.g genus Panthera containing lions and tigers

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32
Q

Define species

A

A group of organisms sharing a large number of physical features and are able to interbreed to make fertile offspring
E.g members of panthera Leo can’t make fertile offspring with members of panthera Tigris :: are not the same species

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33
Q

Define prokaryota

A

Prokaryota are microscopic, the kingdom contains all the bacteria and cynobacteria (blue-green algae)

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34
Q

Define species that are Protoctista

A
  • some are unicellular (major component of plankton)
  • some are colonial
  • some (spirogyra) have plant like cells
  • some (amoeba) have animal like cells
  • some (euglena) have characteristics plant and animal like

-some have many similar cells e.g seaweeds of algae

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35
Q

Name plants that are non flowering and describe how they reproduce

A

Mosses, horsetails and ferns reproduce with spores

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36
Q

Name flowering plants and describe how they reproduce

A

Conifers and flowering plants e.g rose reproduce with seeds

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37
Q

Name some examples of fungi

A

Yeasts (single celled)

Moulds such penicillium

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38
Q

Describe the structure of the fungi

A

Have hyphae that weave together to form the body of the fungus, a mycelium.
Some have cross-cell walls called septa which sub divide the hyphae

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39
Q

How many anamalia phylum are there?

Describe one word to describe most anamalia

A
  • 35

- Motile (ability to move independently using metabolic energy)

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40
Q

Describe the nucleus in prokaryota, Protoctista, Eukaryota, Fungi and Animalia

A 
prokaryota = none 
Protoctista = yes 
Plantae = yes
Fungi = yes 
Animalia = yes
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41
Q 
Describe the mitochondria in:
prokaryota 
Protoctista 
Eukaryota  
Fungi
Animalia
A 
prokaryota = mesosome in some 
Protoctista = yes 
Plantae = yes 
Fungi = yes 
Animalia =yes
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42
Q 
Describe the chloroplasts in:
prokaryota 
Protoctista 
Eukaryota  
Fungi
Animalia
A 
prokaryota = photosynthetic lamellae in some 
Protoctista = some chloroplasts 
Plantae = yes 
Fungi = no 
Animalia = no
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43
Q 
Describe the ribosomes in cytoplasm in:
prokaryota 
Protoctista 
Eukaryota  
Fungi
Animalia
A 
prokaryota = 70s
Protoctista = 80s
Plantae = 80s
Fungi = 80s
Animalia = 80s
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44
Q 
Describe the ER in:
prokaryota 
Protoctista 
Eukaryota  
Fungi
Animalia
A 
prokaryota = none
Protoctista = yes
Plantae = yes
Fungi = yes
Animalia = yes
45
Q 
Describe the vacuole in:
prokaryota 
Protoctista 
Eukaryota  
Fungi
Animalia
A 
prokaryota = none
Protoctista = some
Plantae = large, central and permanent 
Fungi = large centeral and permanent
Animalia = small, scattered and temporary
46
Q 
Describe the cell wall in:
prokaryota 
Protoctista 
Eukaryota  
Fungi
Animalia
A 
prokaryota = peptidoglycan/Murin
Protoctista = some cellulose, some none 
Plantae = cellulose 
Fungi = chitin
Animalia = none
47
Q 
Describe the nutrition in:
prokaryota 
Protoctista 
Eukaryota  
Fungi
Animalia
A 
prokaryota = sapotrophic, autotrophic or parasitic 
Protoctista = autotrophic or heterotrophic 
Plantae = autotrophic 
Fungi = sapotrophic or parasitic 
Animalia = heterotrophic
48
Q 
Describe the nervous coordination in:
prokaryota 
Protoctista 
Eukaryota  
Fungi
Animalia
A 
prokaryota = none
Protoctista = none
Plantae = none
Fungi = none 
Animalia = yes
49
Q

Define homologous structures

A

Structures in different species with a similar anatomical position and developmental origin, derived from a common ancestor

50
Q

Define pentadactyl

A

Having 5 digits (in Chordates)

51
Q

Define analogous structures

A

Babe a corresponding function and similar shape, but different developmental origin
E.g shark and dolphin

52
Q

Define convergent evolution

A

Evolution where structures evolve similar properties but have different developmental origins

53
Q

Define divergent evolution

A

Evolution where a common ancestral structure has evolved and performs different functions
E.g the pentadactyl limb is featured in birds, mammals, reptiles and amphibians but for different purposes e.g walking, swimming, flying and grasping

54
Q

What are the 4 methods which we use to assess relatedness with genetic evidence

A
  • DNA sequences
  • DNA hybridisation
  • Amino acid sequences
  • Immunology
55
Q

Describe how we use DNA sequencing to assess relatedness with genetic evidence

A

More closely related organisms show more similarity in DNA base sequences (which have mutated during evolution).

56
Q

Describe how we use DNA hybridisation to assess relatedness with genetic evidence

A

1- extract DNA from 2 different species
2- separate DNA and cut into fragments
3- mix DNA from two species, where there is complimentary base pairing they hybridise together
4- this shows % DNA in common e.g chimpanzees and humans have approx 95% of shared DNA

57
Q

Describe how we use Amino acid sequences to assess relatedness with genetic evidence

A
  • sequence of amino acids in proteins is determined by DNA base sequence
  • similarity in amino acid sequence of the same protein in 2 species shows relatedness
  • e.g the fibrinogen molecule in mammals has allowed scientists to for a evolutionary tree
58
Q

Describe how we use Immunology to assess relatedness with genetic evidence

A
  • mix the antigens of one species (e.g blood protein albumin) with antibodies of another
  • the antigens and antibodies make a precipitate
  • the closer the evolutionary relationship, the more antigen and antibody react and make more precipitate
59
Q

Define the reproductive definition of species

A

A group of organisms that can interbreed to produce fertile offspring

60
Q

What is the morphological definition of species

A

If 2 organisms look very similar they are likely to be of the same species

61
Q

What does the morphological definition of species take into account?

A

There may be ‘sexual dimorphism’ (e.g male lions having a man and female lions not) which needs to be taken into account

62
Q

Why to organisms of different species not produced fertile offspring

A

Because they have different chromosome numbers or incompatible physiology so hybrids would not be viable

63
Q

Name 2 animals that have reproduced to producer infertile offspring

A

Yak + Cow = Zho

64
Q

What is taxonomy?

A

The identification and naming of organisms

65
Q

What are 3 benefits of taxonomy?

A
  • discover and describe biological diversity
  • investigate evolutionary relationships between organisms
  • classify organisms to reflect their evolutionary relationships
66
Q

Define the term binomial system

A

The system of giving organisms a unique name with 2 parts, the genus and species

67
Q

When was the binomial system introduced? By who?

A

1753

Linnaeus

68
Q

What are the 3 main advantages of the binomial naming system

A
  • unambiguous naming
  • based on Latin, the scholarly language that is used worldwide
  • implies 2 species are related by sharing part of their name r.g panthera Leo is related to panthera Tigris
69
Q

Define biodiversity

A

The number of species and the number of individuals in each species In a specified region

70
Q

How does biodiversity partly depend on the environment

A
  • more plants grow at high light intensities, so bright environments support more herbivores and :: carnivores
  • more energy flowing through and ecosystem produces more species. This means equatorial regions have a much higher biodiversity than polar regions
71
Q

What are major areas of biodiversity referred as?

A

Biodiversity hotspots

72
Q

What are the 3 main reasons why biodiversity can increase/decrease over time?

A
  1. Succession
  2. Natural selection
  3. Human influences
73
Q

Describe how succession leads to varying biodiversity

A

Over time a community of organisms changed its habitat making it more suitable for other species this is called succession. This increased animal biodiversity but decreases plant biodiversity

74
Q

NATURAL SELECTION IS DISCUSSED LATER IN THE COURSE

A

Learn about it later on pg 150

75
Q

How has human influence impacted biodiversity

A

Humans have decrease biodiversity and caused extinction in some species

  • oceans = over fishing + trawlers dredging the ocean floor disrupts habitats
  • tropical rainforests = farming, roads and industry have destroyed habitats and driven many exclusive species to extinction
  • global warming causes increased temperature resulting in the expansion of deserts
  • rivers are polluted with industrial chemicals
76
Q

What is one benefit of human activity and biodiversity

A

Can also support biodiversity through law implementation e.g sewers built in the themes turned the ‘great stink’ into a habitat for salmon, seahorses and a seals.

77
Q

Name 3 points to highlight the significance of biodiversity

A
  • small number of plant species provide staple diet for humans e.g what and rice
  • medicinal drugs are derived from plants and fungi e.g for heart disease + antibiotics
  • living organisms provide important raw materials (rubber and cotton etc)
78
Q

What impact can a reduce in biodiversity have?

Why is this view criticised?

A

-as biodiversity decreases there’s less potential for new: foods, medicinal drugs and new raw materials

This is criticised as it is ‘human centred’ and we should protect biodiversity to preserve uniqueness of all organisms

79
Q

Why are biodiversity index’s beneficial?

A

They are used to monitor biodiversity of a habitat over time to compare biodiversity in different habitats

80
Q

What is the equation to calculate diversity (Sampson’s diversity index)

A

S= 1 - (sum of n( n-1)/ N(N-1)

N= total number of organisms present 
n= the number in each species
81
Q

What can you tell from Simpson’s diversity index

A

The higher the numerical value the higher the biodiversity in an area

82
Q

Why is having more different habitats in an area beneficial for biodiversity?

A

The more habitats the more ecological niches :: the more species can be accommodated and :: more biodiversity

83
Q

Define polymorphism

A

The occurrence of more than one phenotype in a population that can’t be accounted for by mutation alone

84
Q

What is a genes locus?

A

A genes position on a chromosome

85
Q

When is polymorphism shown?

A

When a locus has two or more alleles at frequencies greater than what would occur by mutation alone, the more alleles the more polymorphic

86
Q

Give an example of polymorphism in plants

A

-Gene T controls height, there are 2 different alleles
-In a poppy Gene S controls whether pollen can germinate in the stigma of a flower, there are 31 different alleles
:: Gene S has a greater biodiversity than gene T as more phenotypes (physical characteristic shown) for gene S than gene T

87
Q

Give an example of polymorphism in humans

A

The ABO blood group
E.g in centeral American almost 100% have o (low biodiversity) whereas in New Guinea more have a and B (greater biodiversity)

88
Q

How can % of recessive alleles inform about biodiversity

A

The lower the value of recessive alleles the higher the rate of biodiversity

89
Q

Define genetic or DNA fingerprint/profile

A

Terms for a pattern unique for each individual, related to the base sequence of their DNA

90
Q

What are SNPs (pronounces snips)

A

A DNA mutation where only one base mutates, resting a single base difference
SNPs stands for single nucleotide polymorphisms

91
Q

What are HVRs?

A
  • Regions of DNA that vary, 20-40 base sequences long,
  • often repeated many times,
  • uniques lengths of non-coding DNA are called hyper-variable regions
92
Q

What is important to note about SNPs and HVRs

A

Not all DNA codes for protein, :: it is the non-coding regions that undergo mutation so individuals acquire different base sequences

93
Q

How can we understand biodiversity from a DNA fingerprint?

A

The more SNPs and HVRs a population has, the more difference there are in its DNA fingerprint and :: indicate a greater biodiversity

94
Q

Name one use for the identification of SNPs in genetic fingerprinting

A

Suggested link between SNPs and disease such as sickle cell anaemia, Alzheimer’s disease and cystic fibrosis

95
Q

Define natural selection

A

The gradual process in which inherited characteristics become more or less common in a population, in response to the environment determining the breeding success of individuals possessing those characteristics

96
Q

Describe the process of natural selection

A

1) mutations cause a difference in DNA
2) This causes differences in physical appearance or behaviour creating variation
3) some are more suited to the environment than others and out-compete then for resources creating a competitive advantage
4) those more suited survive better
5) those more suited to the environment have more offspring
6) offspring inherit advantageous alleles and so they are also suited to the environment

97
Q

Give an example of natural selection creating biodiversity

A

A habitat becomes hotter :: over generations those more suited to warmth reproduce effectively until this passes onto most of population

Then a habitat becomes hotter and different features become advantageous and will be selected :: make up of population changes and natural selection creates biodiversity

98
Q

How many natural selection decrease biodiversity

A

E.g when he dinosaurs were wiped out
-asteroid hits earth throwing dust reducing light intensity so plants can’t survive :: herbivores can’t :: carnivores can’t survive reducing biodiversity

99
Q

Define adaptation

A

A change in a species creating a common useful characteristic.
The useful characteristic is called an ‘adaptive trait’

100
Q

What 3 major types of adaptation are there?

A

Anatomical traits
Physiological traits
Behavioural traits

101
Q

Describe an anatomical trait adaptation in animals and plants

A

Animal= sharks, dolphins and penguins all have streamlined bodies to be more efficient at escaping predators and catching food

Plant= some plants don’t have beelines (honey/nectar guides) and :: attract fewer pollinators e.g bees

102
Q

Describe a physiological trait adaptation in mammals

A

During hibernation a polar bear resets its body thermostat to use less energy, the body temp drops to 26 degrees opposed to 37

103
Q

Describe a physiological trait in plants

A

The leaves fall of djcidious plants when the temperature and light intensity drop in the autumn to reduce water loss by transpiration and the risk of dehydration in the winter

104
Q

Describe a behavioural trait adaptation in animals

A

Mating rituals in animals e.g a peacock displaying its tail or dances by flamingos increase animals chance of reproducing

105
Q

Describe a behavioural trait adaptation in plants

A

The hawthorn like many plants flowers In spring when it’s pollinating insects have emerged

106
Q

Why is global warming harming animal and plant relationships

A

Because many plants are flowering before pollinating insects have emerged :: can’t be pollinated

107
Q

What word should I use to describe species producing fertile offspring

A

INTERBREED

108
Q

Give the name of a disease caused by the kingdoms below:
Protoctista
Prokaryota
Fungi

A 
Protoctista = malaria 
Prokaryota = any bacterial disease e.g cholera 
Fungi= athletes foot

✅Biology AS Unit 2 (5 decks)

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