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Lecture 43

BIOL 1000 Lecture 43: Lecture 43
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Department
Biological Sciences
Course
BIOL 1000
Professor
Kevin G.Scott
Semester
Fall

Description
o982 Studied finches at the Galapagos Islands  Differ in beak shapes (adapted for crushing seeds, feeding on cactus flowers, or snagging insects)  Evolution = idea that Earth’s many species are descendants of ancestral species that wee different  from those living today  Philosophers had suggested that life might change gradually over time Aristotle viewed species as perfect and permanent Fossils = imprints/remains of organisms that lived in the past o Began to study fossils in mid 1700s Revealed a succession of fossil forms in layers of sedimentary rock that differed form current life forms 1800 – Lamarck suggested idea of evolution to link fossils to current life forms His theory of how evolution occurs was wrong and made him infamous Thought animals could change traits but using/not using body parts, and pass on those traits  At age 22, boarded the Beagle to sail to the South American coast Noted that characteristics of plants and animals he found made them well suited for their  environment Through studying Charles Lyell’s book, Darwin learned that natural forces change the Earth’s surface  In 1858, Alfred Wallace came up with an almost identical hypothesis to Darwin (Darwin had delayed  publishing his own) 1859, Darwin published On the Origin of Species by Means of Natural Selection “Descent with modification” As descendants of a remote ancestor spread, the accumulate diverse modifications/adaptations  that fit them to specific ways of life in their environment
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