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Lecture

NATS 1660 Lecture Notes - Temperate Climate, Abiogenesis, Natural Selection


Department
Natural Science
Course Code
NATS 1660
Professor
all

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Darwin and Natural Selection
What did he experience
- Found marine fossils in Andes
- Earthquake, elevated landscape
- Conclusion influenced by Lyell “ Earth is neither static nor young”
- Temperate zone organisms similar to nearby tropical zone than to European temperate zone(2)
- Galapagos are mostly unique/ unused to people/ relatively fearless
- 1836- did familial things and studied natural science/ 1840 did academic things
Artificial Experience: Humans have modified other species over many generations by selecting and
breeding individuals with desired traits
Alfred Russell Wallace 1823-1913
- Sent Letter to Darwin-1858
Descent with modification
- Organisms related through decent from ancestors that lived in remote past
- Tree of life- origin the bottom present at the branch’s
Natural Selection and Adaptation( biologist Ernst Mayr)
- Dissected the logic of Darwin’s Theory into three inferences based on five observations
1) Organisms overproduce
2) Yet populations generally stay stable
3) Resources are finite (1st inference: Struggle for existence)
4) Individuals in a population vary
5) Much variability is heritable
- 2nd Inference: Those with favourable traits tend to leave more offspring
- 3rd inference: Gene pool changes
Summary of Natural Selection
1) Success of Natural Selection- Interactions between individuals that vary in heritable traits and
their environment
2) Natural selection produces an increase over time to an adaptation of organisms to their
environment
3) Environmental changes- natural selection may result in adaptation to new conditions
4) Evolutionary Adaptation
Conclusion 22.2 Conclusion
1) Individuals do not evolve
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