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Lecture 4

Lecture 4 - Darwin and the Concept of Natural Selection

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Department
Earth Sciences
Course
Earth Sciences 1083F/G
Professor
Cameron Tsujita
Semester
Fall

Description
Lecture 4Darwin and the Concept of Natural Selection y Galapagos Tortoises o Shapes of shells are different on separate islands o Suggests a common ancestor but since they separated geographically preventing them from interbreeding y Iguanas o Marine iguana is grey and eats seaweed o Lane iguana is brown and eats land plants o Both had a common ancestor but adapted to different environments to exploit different food sources y Finches o Must have had a common ancestor o Diverged to adapt to different food sources o Different beaks for different food sources y If populations of surviving form were unable to mate with those of ancestral form they would ultimately produce a new species that diverged from form of ancestral species o Less fit would die off y Life is a competitive enterprise with limited resources available to populations o Not all individuals are successful o Population of successful individuals reproduced and will dominate the population o Selective breeding for
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