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How can natural selection be modelled? - Coggle Diagram
How can natural selection be modelled?
How do scientific models show theories?
Definitions
Scientific model
representation of facts, events, processes
uses something else to represent it
is easier to understand
Scientific theory
Show theories as they:
Predict and explain certain behaviours
Visually shows processes
Some processes can't be seen
Predicts future patterns
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Provides evidence to theories
Identifies patterns
Natural selection/evolution
Definitions
Evolution
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Populations & species changing over time
Natural selection
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Process certain inherited traits makes it
Easier for some indiviuals to
survive & reproduce then others
Evolution by natural selection
Process of organisms changing over time
Due to changes in heritable either
physical traits
behavioural traits
Importance
Informs us about
proccess of population change
Provide scientific accurate information
Explains theory of evolution
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How does natural selection occur?
4 Main steps
Theres variation in traits
Each species has own traits
Makes them different from other species
Each indiviual within species has unique traits
Makes everybody different
Traits can be:
Benefitical
Neutral
Negative
Different reproduction rates due to selection pressure
Environment can't support
unlimited population growth
selection pressure solves this issue
Kills off individuals with unsuitable phenotypes
Have lower rate of survival
and reproduction
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Leaves individuals with favourable phenotypes
They remain in population
Have higher rate of survival
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Pascale, W., Arena, P., Burrows, K., Lofts, Graeme. & Merrin J, Evergreen., 2018, Jacaranda Core Science stage 5, Wiley, J. & Sons Australia, Ltd, Queensland, pp. 477 – 479
There is heredity
Traits are passed from parent to offspring
Unless DNA mutation occurs which
could cancel trait
alter it
Mostly benefitical traits go to next generation
Because most of population formed
Of organisms with benefitical phenotypes
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mostly, ones with unsuitable phenotypes are:
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Population change
step two - three cause
advantageous trait
-trait help certain individuals survive and reproduce
Becomes more population then disadvantage trait
continuation of process means:
all organisms with unsuitable phenotype
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Real life example natural selection?
Deer mouse (Peromyscus maniculatus)
Link Title
cK – 12, 2018, Theory of Evolution by Natural Selection | CK-12 Foundation,
https://flexbooks.ck12.org/cbook/ck-12-middle-school-earth-science-flexbook-2.0/section/17.5/primary/lesson/theory-of-evolution-by-natural-selection-ms-es
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cK-12, 2020, Natural selection - Actively Learn,
https://read.activelyle
arn.com/#teacher/reader/authoring/preview/749467/notes, date accessed 23/2/21
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Lives in two habitats
Woodlands
Deer mouse is dark brown
Good for camouflaging in woods
Hide from predators
Nebraskan sand hills
Was dark brown
evolved in beige colour
occurred because of natural selection
predators could easily see
dark deer mice in sand hills
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What are selection pressures?
definition
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External agent
affects the ability of organism
survival in given habitat
Different types of impacts
Positive
Increase proportion of needed phenotype
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Phenotype: individual's traits
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Negative
Iessen occurrence of needed trait
Examples of selection pressures
Predators
Disease
Competition
Environmental factors