Transcript 2/22

Office hours aplenty...
http://users.path.ox.ac.uk/~wjames/Evolution/evolution4_files/slide0006_image035.jpg
Fitness measured over many generations
Fig 25.14
Evolution does not always occur at the same rate.
Fig
24.17
Why are intermediate traits sometimes
hard to find?
What drives evolution?
What changes selection
criteria?
Fig 25.14
The rate of evolution depends on the rate of
environmental change.
We do not know what caused the largest
extinction event known.
Fig
25.14
Fig 25.14
Dinosaur extinction
Fig 25.15
an Asteroid impact, 65 mya
Fig 25.7
History of
Earth
Life as
we
know
it…
Fig 26.21
Molecular similarities show relationships that
are not obvious by morphology
Fig 26.2
Convergent
Evolution means
that morphology
is a poor
predictor of
evolutionary
relationships
Fig 26.7
Phylogeny
and its
connection to
evolution
Fig 26.4
Fig 26.3
phylogenetic
hierarchy
an evolutionary tree: comparing gene sequences
Fig 26.13
Phylogenies
as multiple
hypotheses
Fig 26.14
Percent difference between sequence
Fig 26.15
Phylogenies
as multiple
hypotheses:
parsimony
Fig 26.15
Phylogenies
as multiple
hypotheses:
parsimony
(more tree making practice in discussion)
Life as
we
know
it…
Fig 26.21
Fig 34.37
DNA is
passed from
generation to
generation,
and therefore
can tell us
about
relationships
between
species.
The earth is covered in humans. How did this
occur?
Only the egg provides mitochondria to the offspring.
Fig
47.3
mitochondria
Mitochondrial DNA comparisons
can be used to trace ancestry:
mtDNA helped determine what happened to
Anastasia
Non-Coding DNA is
used for comparisons
between individuals
Only DNA that is
successfully passed
on can be used to
trace the past.
Fig 1
•Office Hours
•Bonuses
Next: Are we
genetically
programed
to be racist?