UNIT 3: DARWIN AND MENDEL

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UNIT 3 DARWIN AND MENDEL
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I. Darwins Contributions
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I. Darwins Contributions A. Life - Born
Feb 12, 1809
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I. Darwins Contributions A. Life - Born
Feb 12, 1809 - Graduated Cambridge,
intending to join the clergy
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I. Darwins Contributions A. Life - Born
Feb 12, 1809 - Graduated Cambridge,
intending to join the clergy - 1831-36,
Naturalist on H.M.S. Beagle
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I. Darwins Contributions A. Life - Born
Feb 12, 1809 - Graduated Cambridge,
intending to join the clergy - 1831-36,
Naturalist on H.M.S. Beagle - 1859
Origin of Species
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I. Darwins Contributions A. Life - Born
Feb 12, 1809 - Graduated Cambridge,
intending to join the clergy - 1831-36,
Naturalist on H.M.S. Beagle - 1859
Origin of Species - Died April 19, 1882,
interred in Westminster Abbey
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B. The Origin of Species
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B. The Origin of Species 1. One Long
Argument - observations leading to the
conclusions that - life changes through time
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B. The Origin of Species 1. One Long
Argument - observations leading to the
conclusions that - life changes through time
- species descend from shared ancestors
A B C
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B. The Origin of Species 1. One Long Argument
evidence of ancestry 2. Proposed Hypothesis
for HOW change occurs - Natural Selection
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B. The Origin of Species 1. One Long Argument
evidence of ancestry 2. Proposed Hypothesis
for HOW change occurs - Natural
Selection 3. Dilemmas things that didnt fit
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C. Observations 1. Geology - The Earth is
OLD - James Hutton (1726-1797) Scottish
Geologist
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Hadrians Wall, but by the Roman Emperor Hadrian
in 122 A.D. 2000 years old, but no sign of
erosion. How much older must highly worn and
eroded granite outcrops be?
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And how long must it have taken for the layers of
sediment comprising the White cliffs of Dover to
accumulate?
If rates of erosion and mountain building have
been uniform, governed by the processes we see
operating in nature today, then "(in
geology) we find no vestige of a beginning,no
prospect of an end." . (The Earth is
immeasureably old.)
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C. Observations 1. Geology - The Earth is
OLD - Charles Lyell (1797-1875) British
Geologist Principles of Geology Promoted the
concept of UNIFORMITARIANISM
(slow, steady change, accumulating over long
periods of time, can result in major effects)
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C. Observations 2. Paleontology a. Major
groups appear at different times - additive
recent
Mammals
Birds
Reptiles
Amphibians
Jawed fishes
Jawless fishes
past
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C. Observations 2. Paleontology b. Within a
lineage, there are patterns of gradual change
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C. Observations 2. Paleontology b. Within a
lineage, there are patterns of gradual
change c. Within a lineage, there are patterns
of radiation (many descendants from few
ancestors).
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C. Observations 3. Comparative Anatomy -
Homologous Structures
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C. Observations 3. Comparative Anatomy -
Homologous Structures
Same structure, but different uses in different
environments (correlated pattern)
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C. Observations 3. Comparative Anatomy -
Analogous Structures
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C. Observations 3. Comparative Anatomy -
Analogous Structures
Different structures, but same uses in the same
environment . (again, a correlation between
anatomy and environment)