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AP Biology Evolution Project

lulicoaster ride

Raul Pizano

on 1 March 2011

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Transcript of AP Biology Evolution Project

Species Variation
The differences in species stem from the process of evolution, the variations incurred and promoted through various types of species isolations. Species vary Morphologically, Phylogenetically, and Ecologically Morphological Variation Phylogenetic Variation Ecological Variation Alltogether these fields help group different species into catigories, a process reffered to as taxonomy The reason for the existance of variation is isolation.
Isolation can also be categorized into prezygotic and postzygotic, and then placed into subcatigories respectively. The types of isolation include: habitat, temporal, behavioral, mechanical, and gametic (prezygotic) and reduced hybrid viability, reduced hybrid fertility, hybrid breakdown Habitat Isolation Temporal Isolation Behavioral Isolation Mechanical Isolation Gametic Isolation Reduced Hybrid Viability Reduced Hybrid Fertility Hybrid Breakdown Some first-gen hybrids are viable and fertile, but when mated with one another or parents, offspring of next generation sterile. Hardy-Weinberg Theorem Frequencies of alleles=constant generation to generation True only if Mendelian segregation and
recombination of alleles are at work Hardy-Weinberg Equillibrium p+q=1 p^2+2pq+q^2=1 Homologous Structures Vestigial Organs Appendix Tailbone Body Hair Wisdom Teeth
Evolution and YOU! All the changes that have transformed life on Earth from its earliest beginnings to the diversity that characterizes it today Differences in species characterized by shape, size, and look. Differences in species based on their history. Species are characterized based on thier roles within a community. When sperm of speicies can not fertilize an egg of another species. The genes of different parents impair the growth of the offspring. Morphological differences can prevent successful mating. When the different parents produce an offspring that is sterile. Species that breed during different times, does not allow gametes to mix. Actions isolate species. Species are seperated by geographic features that do not allow interaction between species, furthering variation. Darwin & Lamarck These Guys Mechanical differences can prevent successful mating due to an organism's body structure
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