Zoology Ch. 2 Notes
Zoology Ch. 2 Notes Zool 1604 Animal Biology
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This 5 page Class Notes was uploaded by Terran Johnson on Sunday February 7, 2016. The Class Notes belongs to Zool 1604 Animal Biology at Oklahoma State University taught by Dr. Elisa Cabrera Guzman in Winter 2016. Since its upload, it has received 43 views. For similar materials see Animal Biology in Animal Science and Zoology at Oklahoma State University.
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Eugh...this class is soo hard! I'm so glad that you'll be posting notes for this class
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Date Created: 02/07/16
Species: ● 1.51.9 million ● There are many more but only about 1.41.7 mill. are described/named Why is diversity important? ● Intrinsic value ● Species differ ● Insurance; overlapping species and role in environment provide insurance. ● Rivet Hypothesis:very species is playing some important rol. Natural Selection ● What is a species? Descend from common ancestor: Phylogenetic trees which are constructed using fossil records, DNA data, and compared traits (morphological and physiological Homologous traits:structure that can differ morphologically but have similar makeups. Reproductive compatibility: Hybridizing is rare. Similar Genotypes: Chromosomes: tightly wound bundle of DNA. Gene:sequence of DNA that codes for protei Allelelternate forms of particular protein. ene Pool:All alleles of all genes in a population. Speciation ● Adaptive Radiation: the diversification of a group of organisms into forms filling different ecological niches. ● Natural Selection Must have variation in population Variation must be heritable/ passed on to offspring Organisms produce more offspring than can survive Survival and Reproduction not random ● Allopatric Speciation Geographically isolated Exposed to different environments Cannot Mate Most common Form ● Sympatric Speciation new species evolve from a single ancestral species while inhabiting the same geographic region. Islands are hotbeds of speciation ● Stabilizing Selection: getting less and less variability ● Directional Selection: extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype. ● Disruptive Selection: extreme values for a trait are favored over intermediate values ● Sexual Selection: Selection of traits that provide a reproductive benefit. ● Evolution Microevolution: Changes in Frequencies Macroevolution: Grand scale, new structures, designs. ●
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