A4 unity and diversity of ecosystems Flashcards

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1
Q

biological evolution

A

change in the heritable characteristics (rooted in DNA) of a **population

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2
Q

what does it mean fro a theory to be falsified

A

it is shown that it is not true through the use of empirical evidence

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3
Q

three different molecular evidences for evolution

A
  1. DNA
  2. RNA
  3. Proteins
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4
Q

hox genes

A

the genes that play a role in determining your bodily developpement. These geners are incredibly similar across different types of organisms and would be hard to explain without a common ascestor and evolution

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5
Q

phylogenetic tree

A

a visual diagram that shows which species are most similar and related by comparing the similarity of a single gene

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6
Q

selective breeding

A

choosing organisms to mate together based on whether they have desirable characteristics

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7
Q

artificial selection

A

the result of selective breeding where organisms noe have combinations of traits that were not previously seen and have been curated by humans

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8
Q

homologous
structures

A

structures that share a similar internat structure despite being use for idfferent purposes (divergent evolution)

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9
Q

pentadactyl limbs

A

an example of homologous structres that is front or hind legs/arms that do or did have 5 digits

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10
Q

analogous structures

A

body parts that cary out the same function in different organisms but are structured differently internally (convergent evolution)

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11
Q

convergent evolution

A

when two species evolve independently but develop similar features and adaptations that suit their environment and become mroe similar

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12
Q

speciation

A

the formation of a new species by the splitting of an existing species (can no longer interbreed)

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13
Q

reproductive isolation

A

when populations can no longer interbreed with one another preventing gene flow (can be geographic, behavioral or temporal)

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14
Q

geographic isolation

A

there is a natural or man made barrier seperating males and females preventing mating

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15
Q

sympatric speciation

A

speciation that occurs when mating does not occur despite contact (casued by temporal or behavioral isolation)

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16
Q

allopatric speciation

A

physical geographic barrier leads to a lack of contact and the development of distincts species

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17
Q

behavioral isolation

A

accurs when the mate attracting actions of one group are different to those of another group

18
Q

temporal isolation

A

organisms do not make due to them having different mating seasons or different times to release gametes

19
Q

adaptive radiation

A

similar but distinct species rapidly evolve into different niches from a single or small number of species (can be a result of allopatric speciation)

20
Q

what are the two things required for speciation to occurr

A
  1. reproductive isolation
  2. differential selection (different selection pressures)
21
Q

hybridisation

A

the fertilisation of the fametes from one species by the gametes of another species

22
Q

interspecific hybrids

A

organisms produced by cross breeding two different species to produce new varieties

23
Q

polyploidy

A

when species have three or more copies of each chromosome due to errors in meiosis or hybridisation

24
Q

autotetroploidy

A

the formation of a polyploid organism from members of the same species

25
Q

allotetroploid

A

when a tetraploid organsism forms from the combining of gametes from two different species

26
Q

abrupt speciation

A

when new species form withint a couple of generations as a result of tetrapoildy

27
Q

biodiversity

A

the variety of living organisms and their interactions

28
Q

species richness

A

a measure of the number of different species in an community

29
Q

species evenness

A

a measure of how balanced an ecosystem is

30
Q

gene pool

A

all the different alleles of a gene in a population

31
Q

ecosystem diversity

A

the number of different biomes in an area or the number of mini ecosystems in a biome

32
Q

species diversity

A

the number of unique species that exist within a community/habitat

33
Q

genetic variation

A

the number of different alleles and gene combinations between members of the same species

34
Q

five anthropogenic causes of speciation

A

climate change
habitat loss
invasive species
pollution
overharvesting

35
Q

North Island Giant Moas (species)

A

extinct in New Zeland
haooened 500-1,000 years ago
overhunted by humans for food

36
Q

carribean monk seals (species)

A

extinct in then carribean
50 - 100 years ago
overhunted for oil for lamps

37
Q

dipterocarp forests (ecosystem)

A

dramatic ecosystem loss of forest coverage
ongoing issue
caused by logging for timber, clerance or palm oil plantations

38
Q

meaning

in situ conservation effort

A

the management of biodiversity in the natural ecosystem/habitat

39
Q

meaning

ex situ conservation effort

A

helping species and biodiversity outside their natural habitat/ecosystem

40
Q

examples

in situ conservation effort

A
  1. active management to prevent human influence (nature parks/nature reserves)
  2. rewilging (removing/returning species)
  3. reclamation (replanting/reistablishment)
41
Q

example

ex situ conservation effort

A
  1. zoo breeding programs with artificial insemination
  2. create habitats like botanic gardens
  3. seed and tissue banks
42
Q

what prioritises conservation efforts

A

EDGE use ICUN status and genetic uniqueness