BIOL 112 1nd Edition Lecture 5 Outline of Last Lecture I Lamark II Darwin going the voyage of the Beagle III Things needed for natural selection Outline of Current Lecture II Analogy III Biogeography IV Population genetics Current Lecture o Many points of similarity not always the same function adaptation IN common ancestor homologous characteristic o Darwin observed organisms share characteristics Proposed shared characteristics inherited from common ancestor If there are many shared characteristics homologous structure Analogy convergent evolution o Same adaptation to similar challenge adaptations have same function few other characteristics in common adaptation NOT in recent common ancestor analogous characteristic o Analogy aka homoplasy mold the same way o To distinguish from homology HOMOLOGY Many points of similarity Present in common ancestor ANALOGY Few points of similarity Fig 22 17 Not present in a common ancestor Biogeography o Distribution of species adaptation to their particular environment o Continental drift is a significant factor in determining mammalian biogeography These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Answers why marsupials are predominantly found in Australia Marsupials isolated on Gonawana Island Australia Fig 25 14 Population genetics o Population smallest unit of evolution o Natural selection changes in allele frequency Allele variant of a gene Diploid inherits 2 alleles for every locus Genotype alleles for diploid ex PP Pp pp Phenotype visible characteristics produced by a genotype ex Purple color vs white color Natural selection changes allele frequencies
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