BIOLOGY 1M03 Lecture Notes - Lecture 12: Zygote, Background Extinction Rate, Burgess Shale

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An example of a short answer quesion: see slide. Marsupials and placentals would be sister taxa; monotremes do not have nipples but placentals and marsupials do. You would indicate nipples on the lineage giving rise to marsupials and placentals; it would not be placed on a node; the node doesn"t represent ime; nothing happens at nodes. The evoluion of nipples would have to have happened along a branch (the branch leading up to the node of marsupials and placentals). Biological innovaions can trigger adapive radiaions by opening up opportuniies in an environment that allows species to exploit and occupy novel ecological niches. An example: the cichlid ish which had this extraordinary diversity about 3000 species. 10% of all the teleost which are really successful radiaion of ish and in paricular, the ish in the great lakes of africa have a huge number of species (about 250-800).

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