how old am i? exam #1 f 2/13 bonuses posted. 1.7 million-year-old human ancestor
TRANSCRIPT
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How old am I?
•Exam #1 F 2/13
•Bonuses posted
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1.7 million-year-oldhuman ancestor
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DNA is passed from generation to generation, and therefore can tell us about relationships between species.
Fig 34.40
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How are we related to our ancestors, and where did we come from?
Fig34.42
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More than 10,000 years ago:Hunter-Gatherer
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~10,000 to 200 years ago:Farming-Ranching
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Last 200 years: Industrialization
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Hunter-Gatherer
Agricultural
Industrial
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The earth is covered in humans. How did this occur?
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Human DNA is divided into 46 chromosomes(23 pairs)
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X 23in humans X 23
in humans
X 23in humans
Each of us are a combination of DNA from mom and dad.
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Mitochondria
an Animal Cell
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mitochondria
Only the egg provides mitochondria to the offspring.
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Mom provides 50.000275% and Dad provides 49.999825% of DNA to offspring.
… because Mom provides 100% of mitochondrial DNA
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mitochondria
Traits coded for by mtDNA are inherited only through mother
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Mitochondrial DNA comparisons can be used to trace ancestry:
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Tsar’s Family
During the Bolshevik revolution, the Tsar’s family was captured and executed.
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Tsar’s Family
There are many stories about what happened to their youngest daughter Anastasia
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Anna Anderson, claimed she was Anastasia
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Anna Anderson claimed she was Anastasia, but tests of her mtDNA and one of Anastasia’s maternal relatives did not match.
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For more info check out: http://en.wikipedia.org/wiki/Grand_Duchess_Anastasia_Nikolaevna_of_RussiaOr the book “Seven Daughters of Eve” by Bryan Sykes
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When did these migrations take place?
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Non-Coding DNA is used for comparisons between individuals
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Fig 1
Only DNA that is successfully passed on can be used to trace the past.
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Fig 1 and 4
As DNA is passed on mutations take place
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Fig 4
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Fig 4
By determining the average time between mutations, we can estimate the time of the last common ancestor.
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Fig 4
The mutation rate in human mtDNA is one nucleotide change per 20,000 years.ORA difference of one nucleotide between two people indicates a common relative 10,000 years ago.
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Multiregional hypothesis
“Out of Africa” hypothesis
Two hypotheses about the origin of H. sapiens
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7 Daughters of Eve, fig. 1
Relationships of different populations using mtDNA
~150,000ya
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Multiregional hypothesis
“Out of Africa” hypothesis
Two hypotheses about the origin of H. sapiens
X
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7 Daughters of Eve, fig. 2
Relationships of different people using mtDNA.
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7 Daughters of Eve, fig. 2
Relationships of different people using mtDNA.
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7 Daughters of Eve, fig. 2
Relationships of different people using mtDNA.
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7 Daughters of Eve, fig. 2
From Science v298 12/20/02 pg 2381
•93-95% of genetic variation within population.
•3-5% of genetic variation occurs between populations.
Relationships of different people using mtDNA.
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“Man’s Most Dangerous Myth: the Fallacy of Race” by Ashley Montagu
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Next: Are wegeneticallyProgramedto be racist?
•Exam #1 F 2/13
•Bonuses posted