BIOB51H3 Lecture Notes - Lecture 6: Convergent Evolution, Monophyly, Macroevolution
2 Mar 2018
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Natural experiment 2 (darwin"s finches): adaptive radiation: when a few groups of organisms underwent evolution to form different lineages. These were produced more in 1977, than the small seeds: the beak size of g. fortis increased as years passed because of the drought, from the shift of small seeds to large seeds. In 1995, another species was found, which was known as geospiza magnirostris: this was physically much larger than the g. fortis. In a hypothetical situation, there is an ancestral primate with a single-male mating system. G, and h: traits and evolutionary relationships, pleisiomorphy: an ancestral character. It is a trait found in the common ancestor of a clade: for example, all mammals have lungs, limbs, and amniotic eggs, apomorphy: derived trait. It is an evolutionary novelty (shown after the ancestral node) It is a character that is present in another species that wasn"t present in the ancestor. It is a defining feature of species: synapomorphy: shared derived trait.
