During your life, you experience new changes and then pass it onto your offspring
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Example of Lamarck’s Theory
Inheritance of acquired characteristics
Giraffe passed the traits of having long necks because their ancestors kept stretching their neck to eat the leaves to tall trees and grew their neck over time
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Natural Selection
The mechanism of evolution, how it happened
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Other people who made theories about how evolution works
Erasmus Darwin, Jean Baptistery Lamarck
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William Paley
Natural theology
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Charles Darwin
Rich guy who when on a long voyage learning about how organisms were different from place to place
Collected a lot of evidence and studied finches
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When did Darwin go on the Beagle voyage
1931 - 1936
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How long did Darwin take to develop his theory?
1937 - 1959
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Alfred Russel Wallace
Sent Darwin a letter that he had the same idea
Wasn’t rich and collected samples of orangutang for museums (by killing them)
Believe life/resources was unlimited at the time
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When did Wallace send a letter to Darwin?
1958
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Competition
Out compete the others
Since resources are limited, not everyone will have the resources to survive and some will have more than others
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Who came up with the idea of Competition?
Malthus (based on the course of human population)
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Variation
There were variations between individuals
Such as teeth to eat better fruit to allow more energy for reproduction
Affects ones ability to survive and reproduce
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Reproduction
Maximizing reproduction to pass down your genetics
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Inheritance
Passing down genetics to offspring
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Finches
Studied by Darwin
They have different beak sizes based on their diet
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Adaptation
A feature shaped by natural selection, promoting survival and reproduction
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Fitness
The relative ability of an organism to survive and transmit its ends to the next generation
Be better than other animals to have success
There is not global fitness, just the local fitness of the area
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Direct fitness
Number of your genome copies you pass directly to the next generation
Counting babies
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Indirect fitness
Number of your genome copies passed indirectly to the next generation via kin
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Inclusive fitness
Number of genome copies that are passed in total to the next generation
Direct + indirect fitness
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Inclusive fitness theory (kin selection)
Natural selection favours traits that maximize inclusive fitness
Both the genes are spread through both direct and indirect fitness
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Hamilton's Rule
c < b \* r
You are less likely to go out of the way to save someone who isn’t related to you
The more closely related you are, the higher than chance
2 brothers = 8 cousins in terms of genetics
Humans are special as we also help non kin
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Typological thinking
Species are unvarying
There was always a dog, wolf, elephant
They just evolved into their best form (ideal types/essences)
No variation
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Evolutionary thinking
Variation within species is the essence
Why some primates do certain things, when some are better than others
Individual = samples of population
Based on probabilities, not certainties
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Tree thinking (phylogenetic)
Variation between species from LCA
Examine when traits arose and why (what pressures occurred at that time)
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What was the massive shit in thinking towards evolution?
Humans are the most evolved species and all species are evolving to be like humans
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Not directional
Selection imparts an advantage to certain individuals in a particular environment at the particular moment
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Mutations
Drives evolution and creates variation
Is quite rarely and usually doesn’t work
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Genetic drift (Neutral Theory of evolution)
Random fluctuations in allele frequencies
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Population bottleneck
Contraction of population size due to evironmental events/ecological factors
Finches: Drought, reducing genetic diversity (small beak ones die while bigger beaks lived)
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Founder effect
Founding of a new population by a non representative sample
Finches: A group of finches moved to another island, limiting genetics to only the finishes within that group
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Incidental by product
Something that is trivially adapted
Bones: Contain calcium for structural integrity thus are white and is not something evolution is selecting for or against
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Phenotype
A description of your physical traits
What you see and its behaviour
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Genotype
Your habitable genetic identity
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Phenotypic plasticity
The ability of one genotype to produce more than on phenotype when exposed to different environments
Milk: Drink more milk = taller, drinking less milk = shorter
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Behaviour
How animals interact with the environment and each other
Their response is carried out by musculoskeletal system
Relies on genetics, neurobiology, endocrinology, physiology, evolution and ecology
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Fox domestication
Only foxes that reacted nicely to being pet were allowed to breed
After a few generations certain traits such as spotted coats started to show which is also common to other domesticated animals