15.3 – darwin presents his case
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15.3 – Darwin Presents His Case. After Darwin’s journeys he wrote and published a book called On the Origin of Species In this book he proposed his thoughts on how evolution happened called natural selection. Darwin’s Publication. Natural Variation vs Artificial Selection. - PowerPoint PPT PresentationTRANSCRIPT
*15.3 – Darwin Presents His Case
*Darwin’s Publication*After Darwin’s journeys he wrote and
published a book called On the Origin of Species*In this book he proposed his thoughts on
how evolution happened called natural selection
*Natural Variation vs Artificial
Selection
*Evolution by Natural Selection*Darwin proposed that as populations grew
that there would be a struggle for existence*A key factor in the above would be survival of
the fittest*Successful adaptions enable organisms to be
better suited for environment *Those adaptations are then passed on to next
generations*Those that are adapted best for their
environment will have more offspring and those that are not will either die or have few offspring*http://
www.youtube.com/watch?v=nS1tEnfkk6M*http://www.youtube.com/watch?v=GPbWJPsBPd
A&feature=fvsr
*Descent with Modification*Darwin proposed that over long periods of
time organisms developed different structures to adapt to different environments*As a result species today look different
from their ancestors*Common Descent*All species-living and extinct-were derived
from same ancestors
*The Fossil RecordArchaeopteryx
*Lucy
Beaver
NORTH AMERICA Muskrat
Capybara SOUTH AMERICA
Coypu
* Geographic Distribution
of Living SpeciesSection 15-3
Beaver MuskratBeaver andMuskratCoypu CapybaraCoypu andCapybara
Turtle Alligator
Bird Mammals
Typical primitive fish
*Homologous Body StructuresSection 15-3
*Vestigial Organs
*Similarities In Early
Development
*Concept Map
includes
Evidence of Evolution
Physical remains of organisms
Common ancestral species
Similar genes Similar genes
which is composed of which indicates which implies which implies
The fossil record
Geographic distribution of living species
Homologous body
structures
Similaritiesin early
development