Bio2 Lecture 20

Bio2 Lecture 20 - Bio2 Lecture 20 New lecturer Randy...

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Bio2 Lecture 20 4/5/05 New lecturer: Randy Gaugler 212 Blake Hall, Cook 932-9459 [email protected] Theories explaining Biodiversity 1. E.T. version, extraterrestrials coming from outer space and seeding the planet 2. Creation immutable, creationism, biblical, Indian, or other ones. Supreme supernatural being created all life, fundamental aspects are that species are immutable, here as they have always been. In 1619 Lucilio Vanini challenged the grand ideologies of the time and was burned at the stake. Galileo said we are a small speck among millions of other planets solar systems. 3. Darwinian Evolution, life is changing and is changing all the time. Some species are very closely related, and other species are very distantly related. Darwin only came up with a mechanism for evolution, grouping it. Great thinkers: a. Malthus – species cannot just grow exponentially, some point they will outstrip their resources, so there is a struggle for existence. b. Lyell – father of geology, came out with his book a year before Darwin left for Galapagos. Challenged the age of earth. Lyell said earth is much older than 6000 years old, and changes very gradually. c. Lamarck – French scientist, in 1801 came up with first theory of evolution, called theory of species formation. Said individuals acquire traits during their lifetimes and pass those to their offspring and this can cause enough change over time to become new species. d. Darwin – Was influenced most by the Galapagos Islands. Very arid, inhospitable island. People go there to see wildlife. Darwin was impressed with wildlife. Wondered how their could be so many unique species in hostile island. Springboard for his theory of natural selection. “Individuals born with traits that make them best adapted for their environment are also the ones most likely to survive and produce offspring.”(adaptation is a modification in structure of function in response to an environment that increases an organisms likelihood of survival). (fitness – survive and produce offspring for the next generation, the larger the genetic
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