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How can the process of Natural Selection be Modelled? - Coggle Diagram
How can the process of Natural Selection be Modelled?
Natural Selection
Examples
Darwin's Finches
Darwin inferred that the population of finches seperated as the islands were formed,
the interbreeding between finches of different islands ceased,
certain traits, such as beak size and shape were more favoured and survived to reproduce offspring that could inherit these superior traits.
Giraffes grew longer necks to access food sources in trees
Organisms that are better adapted to their environment have an increased chance of survival and reproduction
Organisms pass on their favourable
adaptations to their offspring
The organisms with unfavourable characteristics are more likely to die before reproducing.
Selection Pressures
Human activities
Deforestation
Hunting
Pollution
Urban Crawl
Natural pressures
Smaller Territory
Increased predation
Limited access to food
Less attraction to mates
Competition
Dominant species
inter species competition
Environment
Temperature
CLIMATE
Availability
Food
Shelter
Land
Water
Evolution
Any change in the heritable traits within a population across generations
Heritable traits - Features that can be passed on to offspring
Genetic Variation
All living things appear to come from an ancient common ancestor
We don't know what the ancestor is
Everyone's DNA is unique
Errors in DNA are called Mutation
Mutations are passed on to offspring when living things reproduce
They can benefit or disadvantage the organism
Any organism in the same species will show variation physically
Neck length of Giraffes
Feathers were initially used similarly to fur
their use for flight came later
