BIOL-3350 Chapter Notes - Chapter 1: Natural Selection, Estuary, Astragalus

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12 Jan 2018
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Book example talks about cetaceans (dolphins and whales) and how they descended. By understanding evolution, we can understand the similarities between different species. Biological evolution is any change in the inherited traits of a population that occurs from one generation to the next. Lineage refers to a chain of ancestors and their descendants. Natural selection is the mechanism that can lead to evolution from mammals that lived on land. The mammary glands on whales and land mammals are examples of homology because they are structural characteristics that are shared and inherited from a common ancestor. Synapomorphy is a derived form of a trait that is shared by a group of related species. The group of mammals that cetaceans evolved from are artiodactyls (cows, goats, camels and hippos (mostly hippo related)). Fossils aren"t the only way to get clues about the origins of cetaceans, can also look at their atoms. See the water they drank, fresh or salt water.

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