BIOSC 0160 Lecture Notes - Lecture 13: Drosophila Melanogaster, Phylogenetic Tree, Pupa
22 Feb 2016
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Phylogenetic tree: begin with invertebrates vs. vertebrates (fruit fly, ladybug, grasshopper, separate by developmental stages (metamorphosis) i. Fruit fly and ladybug have pupa stage (complete metamorphosis: separate vertebrates by tetrapods (can walk on land and have warm-blooded 4 chamber hearts) and those that are able to move underwater i. Human and cat have four limbs and hair and mammary glands chicken and eagle have feathers. All species are independent (unrelated to each other) Life on earth is young (about 6000 years old) Believed earth to be much older than previously thought based on how long it takes for natural processes (lava specifically) to occur. Noticed fossil organisms look very much different from known organisms. Had idea that organisms are not unchanging and can become extinct. Met criticism from creationism who believed that every being was built to a. Geological forces had gradually shaped the earth and continue to do so.
