Biology 3466B Lecture Notes - Lecture 12: Alloenzyme, Even-Toed Ungulate, Mutation Rate
25 Aug 2013
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Throughout western and eastern europe, 2 particular species of crow preside in specific habitats where they are most successful. The hooded crows prefer farmland territory, while carrion crows prefer alpine valleys. As these are more transitional habitats, hybrid offspring arising from these crow species have similar or higher fitness than their parental forms. Studying the hybrid zones present in sage brushes, 3 unique indigenous habitats were examined: the basin zone (lowest elevation), the hybrid zone (intermediate elevation) and the mountain zone (highest elevation). Among these three habitual zones, there is a gradual change in morphology/phenotype and the parental forms are to be found in the two extremes (basin and mountain ranges). Ultimately, through the reciprocal transplant of species into experimental gardens, the hybrid fitness was much higher than the parental forms in the intermediate zone, resulting in a stable hybrid zone. (phylogenetics ii) A pulley-shaped astragalus bone is a synapomorphy that defines artiodactyl (even-toed) ungulates such as moose and hippos.
