Lecture 2

Lecture 2 - History of Evolutionary Thought (these topics...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
History of Evolutionary Thought (these topics revisited through the course) 1) Before Darwin (pre 1859) 2) Darwin (1859) 3) Theories after Darwin (early 1900’s) 4) The evolutionary synthesis (1930’s, 40’s) 5) Biology since the synthesis (1950 on)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Variation?
Background image of page 2
Before Darwin Plato and Aristotle Concept of eidos ‘form’ or ‘idea’ or ‘essence’ e.g. horses have an immutable (unchangeable) essence, but each individual has its imperfections This view is called essentialism and under this view variation is accidental imperfection
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
pre -Darwinian view: variation is accidental imperfection
Background image of page 4
Before Darwin Jean-Baptiste Pierre Antoine de Monet, Chevalier de Lamarck Developed theories of phenotypic evolution and of speciation
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lamarck’s theory of phenotypic evolution: inheritance of acquired characteristics Traits acquired during the course of an individual’s lifetime were passed on to offspring ( e.g. lengthening of giraffe’s necks and thickening of a blacksmith’s arms) generation 1 generation 2
Background image of page 6
Lamarck’s theory of speciation: species originate by spontaneous generation, and have not originated from common ancestors
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lamarck’s theory of speciation: species originate by spontaneous generation, and have not originated from common ancestors
Background image of page 8
History of Evolutionary Thought (these topics revisited through the course) 1) Before Darwin (pre 1859) 2) Darwin (1859) 3) Theories after Darwin (early 1900’s) 4) The evolutionary synthesis (1930’s, 40’s) 5) Biology since the synthesis (1950 on)
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Charles Robert Darwin
Background image of page 10
Darwin’s life Lived 1809-1882 Voyage of the Beagle lasted 1831-1836 Darwin became an accomplished naturalist Theory formulated via INDUCTION After formulating his theory, he spent much time trying to sort out flaws Published the Origin of Species in 1859 (>150 years ago!) The power and brilliance of Darwin’s idea of natural selection is often underestimated The idea was one of the most important, general, and powerful ideas in the history of thought
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The “Origin of Species” actually has two major theses (and five overall theories) 1) Descent with modification (evolution) 1) Causal agent of evolutionary change (natural selection)
Background image of page 12
Descent with modification (the only figure in the Origin of Species )
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Early in generation 1: Heritable (genetic) differences in phenotype Later in generation 1: Natural selection acts Generation 2: Evolutionary change via natural selection Natural selection as a cause of evolution
Background image of page 14
The “Origin of Species” actually has two major theses (and five overall theories) 1) Descent with modification - a succinct term to describe biological evolution 1) Natural selection is differential survival or reproductive success of classes of entities that
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 16
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 46

Lecture 2 - History of Evolutionary Thought (these topics...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online