6 feb opener: who came up with the idea of evolution? agenda review of natural selection big picture...
TRANSCRIPT
6 Feb Opener: Who came up
with the idea of evolution? Agenda
Review of Natural Selection
Big Picture on Evolution
Homework
Experience
Intuition
Authority
Philosophy
Science
Science, in terms of the ways of knowing
discussed by Kerlinger (1973), might be
considered a special case of the
combination of experience and reason.
While inspiration or intuition often plays
an important role in scientific discovery,
it must be subjected to experience that
can be publicly verified and reason
before it is accepted.
Ways of Knowing
Evolution Misconceptions
http://evolution.berkeley.edu/evosite/misconceps/IHowitworks.shtml
http://learn.genetics.utah.edu/content/variation/misconceptions/
10 Feb Opener:
What types of evidence do you think Darwin used to support his idea of natural selection?
Agenda History of Evolutionary
Thought
Homework none
Natural selection There is heritable variation within
populations
More offspring are born than can survive
The result is a competition for limited resources
Some organisms survive & reproduce based on adaptationCharles Darwin
11-13 Feb Opener:
What types of evidence do you think Darwin used to support his idea of natural selection?
Agenda Evidence for Evolution
by Natural Selection Prezi
Homework
Evidence for Evolution Prezi:
http://prezi.com/-22ga7qqd6hr/copy-of-ap-bio-evolution-3-evidence-of-evolution/
16 Feb Opener: The diagram below
shows a comparison of nitrogen base sequences in the DNA of some organisms to those of a human. According to this diagram, humans may be most closely related to _________
Agenda Great Transformations
video
Homework none
18 Feb Opener: The diagram below
shows a comparison of nitrogen base sequences in the DNA of some organisms to those of a human. According to this diagram, humans may be most closely related to _________
Agenda Review
Homework Formative quiz
tomorrow
4 Apr Opener Agenda
Welcome Back! New Seats Review natural selection Artificial Selection
Homework Read p. 287 and 8.2 (again) BRING BOOK TOMORROW
Examples of Natural Selection
In a group of Zebras, some are fast, some are slow
Lions catch the slowest zebras first
Slow zebras are often killed before they can reproduce
Therefore, the genes for slowness don’t get passed on, but the genes for fastness do
Over time, the population of zebras becomes faster
•How else could a population of Zebras change to avoid being eaten?•How do you think the population of lions changes?
5 Apr Opener:
Page 287 in our book talks a lot about “chance and selection” in regard to evolution. How does “chance and selection” summarize evolution?
Agenda Chapter 8
participation assignment
Co-evolution/mimicry
Homework None
Regents Biology
Evidence supporting evolution Fossil record
shows change over time
Anatomical record comparing body structures
homology & vestigial structures embryology & development
Molecular record comparing protein & DNA sequences
Artificial selection Biogeography
Regents Biology
1. Fossil record Layers of rock contain fossils
new layers cover older ones creates a record over time
fossils show a series of organisms have lived on Earth over a long period of time
Regents Biology
Fossils tell a story…
the Earth is oldthe Earth is old
Life is oldLife is old
Life on Earth has changedLife on Earth has changed
Regents Biology
Fossil of Archaeopteryx lived about 150 mya links reptiles & birds
Today’s organisms descended from ancestral species
Today’s organisms descended from ancestral species
Evolution of birds
Regents Biology
Land Mammal
?
???
Where are the
intermediate
fossils?Where are the
intermediate
fossils?
Ocean Mammal
Someone’s idea of a joke!
But the joke’s on them!!
Complete seriesof transitional
fossils
We found the fossil — no joke!
Regents Biology
Evolution from sea to land 2006 fossil discovery of early tetrapod
4 limbs Missing link from sea to land animals
Regents Biology
2. Anatomical record
Animals with different structures on the surfaceAnimals with different structures on the surface
But when you look under the skin…But when you look under the skin…
It tells an evolutionary story of common ancestorsIt tells an evolutionary story of common ancestors
Regents Biology
Compare the bones The same bones under the skin
limbs that perform different functions are built from the same bones
How could thesevery different animals
have the same bones?
Regents Biology
Homologous structures Structures that come from the same origin
homo- = same -logous = information
Forelimbs of human, cats, whales, & bats same structure
on the inside same development in embryo different functions
on the outside evidence of common ancestor
Regents Biology
But don’t be fooled by these…
Analogous structures look similar
on the outside same function different structure & development
on the inside different origin no evolutionary relationship
Solving a similar problem with a similar solutionSolving a similar problem with a similar solution
Regents Biology
Analogous structures Dolphins: aquatic mammal Fish: aquatic vertebrate
both adapted to life in the sea
not closely related
Regents Biology
Convergent evolution 3 groups with wings
Does this mean they have a recent common ancestor?
Flight evolved 3 separate times — evolving similar solutions to similar “problems”
Flight evolved 3 separate times — evolving similar solutions to similar “problems”
No!
Regents Biology
Convergent evolution led to mimicry Why do these pairs look so similar?
Monarch male Viceroy male
fly bee moth bee
Which is the fly vs. the bee?Which is the moth vs. the bee?
Regents Biology
Vestigial organs- body part that no longer serves a function
Hind leg bones on whale fossils
Why would whales have pelvis & leg bones if they were always sea creatures?
Why would whales have pelvis & leg bones if they were always sea creatures?
Regents Biology
Comparative embryology Development of embryo tells an
evolutionary story similar structures during development
all vertebrate embryos have a “gill pouch” at one stage of development all vertebrate embryos have a “gill pouch” at one stage of development
Regents Biology
3. Molecular record
100 20 30 40 50 60 70 80 90 100 110 120
LampreyFrogBirdDogMacaqueHuman
328 45 67 125
Comparing DNA & protein structure everyone uses the same genetic code!
DNA
compare common genes compare common proteins
compare common genes compare common proteins
number of amino acids different from human hemoglobinnumber of amino acids different from human hemoglobin
Regents Biology
Building “family” treesClosely related species are branches on the tree — coming from a common ancestorClosely related species are branches on the tree — coming from a common ancestor
Regents Biology
How do we know natural selection can change a population? we can recreate a similar process “evolution by human selection”
4. Artificial selection
“descendants” of wild mustard“descendants” of wild mustard
Regents Biology
Selective BreedingHumans create the change over timeHumans create the change over time
“descendants” of the wolf“descendants” of the wolf
Regents Biology
Artificial Selection gone bad! Unexpected
consequences of artificial selection
Pesticide resistancePesticide resistance
Antibiotic resistanceAntibiotic resistance
Regents Biology
Insecticide resistance Spray the field, but…
insecticide didn’t kill all individuals variation
resistant survivors reproduce
resistance is inherited insecticide becomes
less & less effective
Regents Biology
Organisms found in a particular area tend to be more closely related to each other than they are to organisms found in other areas.
5. Biogeography