PostDarwinian Facts

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Post-Darwinian Facts I. Physics II.
Geology/Paleontology III. Genetics
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III. Genetics obviously, the most direct way to
test hypotheses of biological relatedness is to
compare DNA.
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III. Genetics obviously, the most direct way to
test hypotheses of biological relatedness is to
compare DNA. - DNA comes ONLY from ancestors,
and we now how it is replicated and passed to
offspring.
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III. Genetics obviously, the most direct way to
test hypotheses of biological relatedness is to
compare DNA. - DNA comes ONLY from ancestors,
and we now how it is replicated and passed to
offspring. - DNA similarity implies a common
source of this DNA common ancestry. - within
a species paternity tests
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III. Genetics obviously, the most direct way to
test hypotheses of biological relatedness is to
compare DNA. - DNA comes ONLY from ancestors,
and we now how it is replicated and passed to
offspring. - DNA similarity implies a common
source of this DNA common ancestry. - within
a species paternity tests - Patterns between
species? 1. GROSS CHROMOSOMAL SIMILARITIES
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2. SEQUENCE ANALYSES - Human and chimp DNA is
98.4 similar in nitrogenous base sequence.
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2. SEQUENCE ANALYSES - Human and chimp DNA is
98.4 similar in nitrogenous base sequence. -
well, we are similar (mammals, primates, etc.)
So, to be similar, dont we need similar recipes?
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2. SEQUENCE ANALYSES - Human and chimp DNA is
98.4 similar in nitrogenous base sequence. -
well, we are similar (mammals, primates, etc.)
So, to be similar, dont we need similar
recipes? - But, only 10 of the genome is a
recipe. Even the 90 that does not code for
protein, that is random sequence, still shows
this similarity. Even non-functional DNA is
similar, so functional similarity (ie., ANALOGY)
cant be the answerthe similarity is HOMOLOGOUS.
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3. Corroborating Independent Tests of Evolution
- We build family trees with paleontology
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3. Corroborating Independent Tests of Evolution
- We build family trees with paleontology - We
build family trees with genetic similarity.
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3. Corroborating Independent Tests of Evolution
- We build family trees with paleontology - We
build family trees with genetic similarity. If
both these patterns are caused by common ancestry
(and evolution), then they should be the SAME
pattern.
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3. Corroborating Independent Tests of Evolution
Testing Evolutionary Theory (yet again) IF
species are descended from common ancestors (like
people in a family), and IF we know the rate of
genetic change (mutation), THEN we should be
able to compare genetic similarity and predict
where in the fossil record common ancestors
should be.
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3. Corroborating Independent Tests of Evolution
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3. Corroborating Independent Tests of Evolution
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3. Corroborating Independent Tests of Evolution
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4. Conclusions - We can compare the DNA in
existing species and predict where, in the
sedimentary layers of the Earths crust, a third
DIFFERENT species should be. - No explanation
other than evolution predicts and explains this
ability. Evolution by Common Descent is a tested
theory.