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Lecture 33

BIOL 1020 Lecture 33: Lecture 33

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Biological Sciences
BIOL 1020
Joy Stacey

Lecture 33 EVOLUTION Overview: Endless forms most beautiful A new era of biology began in 1859 when Charles Darwin published The Origin of Species by Means of Natural Selection The Origin of Species focuses biologists attention on the great diversity of organisms Darwin explained what mechanism could have accounted for diversity Darwin noted that current species are descendants of ancestral species (up until this point people thought that the world was static) Evolution can be defined by Darwins phrase descent with modification o Each generation is a little different from the previous generation Evolution can be viewed as both a pattern and a process Darwin did not know about DNA or what a gene was now that we do know that we can see how it meshes Ideas about Change over time The study of fossils helped to lay the groundwork for Darwins ideas Fossils are remains or traces of organisms from the past, usually found in sedimentary rock, which appears in layers or strata More simple forms are found in lower layers of strata and more complex organisms are found in higher layers of strata Lamarcks Hypothesis of Evolution Lamarck hypothesized that species evolve through use and disuse of body parts and the inheritance of acquired characteristics o Provided Darwin with an early hypothesis that allowed Darwin to think that things change over time The mechanisms he proposed are unsupported by evidence Descent with modification by natural selection explains the adaptations of organisms and the unity and diversity of life As the 19 th century dawned, it was generally believed that species had remained unchanged since their creation However, a few doubts about the permanence of species were beginning to arise Darwins Research Charles Darwin had a consuming interest in nature
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