BIOL 2P05 Lecture Notes - Lecture 5: Annelid, Biogeography, Pentadactyl
29 May 2016
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Large amounts of change (change in allele frequencies at many loci, addition of genes with new functions, etc. ) Macroevolutionary change i. e, gives rise to new species. Change above the species level, i. e. , formation of new species and higher taxa. Relatively easy to devise experiments to test for micro-evolutionary changes. Split into 2 subpopulations and each has different set of conditions. Difficult to design experiments to test for macroevolutionary changes. This is an example of macroevolution in ostrich-like birds- including ostriches, rheas, emus, kiwis and cassowaries. Before continental drift was established the distribution of these birds was a mystery. Strong selection produces rapid evolution in large populations. Organisms are mosaics of parts with different ages. The focus of selection is not on survival but on reproductive success. Female is suspended- male searches for her and copulates. As soon as sperm is being transferred, he somersaults and positions himself at her mouth and she begins to feed.
