DEVELOPMENT-OF-EVOLUTIONARY-THOUGHT-PPT (1)

Discover the scientists that contributed to the development of evolutionary thought.
Understand how these theories contributed to modern science.
Explore other achievements of scientists that shaped knowledge in biology.

Pioneered the concept of sexual reproduction in plants.
Published Systema Naturae in 1735: a comprehensive classification system.
- Classification Levels: Kingdom, Phylum, Class, Order, Family, Genus, Species.
- Introduced the binomial nomenclature (two-word Latin naming system).
Laid the foundation for modern classification systems.

Influential English cleric and economist.
Authored An Essay on the Principle of Population (1798).
- Proposed that human populations can outgrow resources.
- Argued that disease and famine help control population size.

Developed the theory of catastrophism.
Classified animals based on body plan.
His studies of fossils led to the establishment of paleontology.
- Helped interpret fossil remains and relate them to living species.

Proposed the theory of gradualism.
- Suggested that the Earth is extremely old and shaped by ongoing processes like erosion and sedimentation.
Challenged the need for catastrophic events to explain geological features.

Supported Hutton's theory with observations of ancient raised seabeds and geological changes.
Authored Principles of Geology, influencing Darwin's evolutionary theories.

Proposed Theory of Use and Disuse.
- Suggested organisms can develop or lose traits based on usage, affecting heredity.
Introduced Theory of Acquired Traits, where adaptive traits can be inherited.

Formulated the theory of Natural Selection.
- Noted variations in offspring could affect survival and reproduction.
- Introduced the concept of fitness related to survival and reproduction ability.
Suggested speciation occurs when changes accumulate over generations.
- Proposed Common descent: species share common ancestry.

Both Darwin and Lamarck recognized that life evolves from simpler to more complex organisms.
Both acknowledged that organisms adapt over time to better suit their environments.

Conducted pivotal experiments on dominant and recessive traits in pea plants, proving aspects of natural selection.
Established foundations of heredity through genetic research.

Observed gaps in the fossil record indicating mass extinction events, leading to the development of catastrophism.
Recognized that catastrophic events influenced the fossil succession.

Proposed that profound geological changes happen slowly over time, forming a parallel to biological evolution.

Assumption of Change: Darwin believed species can change over time, supported by fossil evidence.
Earth's Age: Influenced by Lyell’s work, Darwin recognized Earth's age allows for evolutionary processes.
Malthus's Influence: Acknowledged that population overproduction leads to competition and struggle for existence.
Artificial Selection: Observed that variations exist and can be inherited, playing a key role in natural selection.
Natural Selection: Defined as nature selecting the most beneficial traits for survival and reproduction.
Speciation: Infers that significant changes via natural selection can lead to new species.

Aristotle: Viewed species as unchanging but recognized affinities among them.
Carolus Linnaeus: Classified species using a nested system; formed the basis of taxonomy.
Georges Cuvier: Advocated catastrophism, linked extinctions to layers of fossils.
James Hutton: Suggested gradual geological processes could explain Earth's features.
Charles Lyell: Proposed uniformitarianism—that geological processes are consistent over time.
Jean Baptiste Lamarck: Introduced theories of use/disuse and inheritance of acquired traits.
Charles Darwin: Proposed evolution via natural selection, published The Origin of Species.