Lecture Notes Lec

Lecture Notes Lec - Lecture Notes Lec. 4 Natural Selection:...

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Lecture Notes Lec. 4 Natural Selection: Increase in traits that enhance reproduction from one generation to the next -if phenotype is successful, all alleles will pass on -Natural selection deals with REPRODUCTION, NOT SURVIVAL Genetic Definitions: Gene – section of DNA that encodes information for a protein. Locus – physical placement of that gene on a chromosome. Allele – a form of that gene DOMINANT – DETERMINES THE PHENOTYPE RECESSIVE – only seen in homozygote CO-DOMINANT – heterosygotes eshibit both traits Heterozygote – having two different alleles of a certain gene Homozygote – two identical allesls of a certain gene. Genotype vs. Phenotype Phenotype – physical makeup Genotype – all of the alles of every gene in an individual Genes regulation: biochemical processes, growth and development, and morphological traits. IMPORTANCE OF VARIATION: no variation in processes, phenotypes, evolution, natural selection Genetic Diversity: variation in genetic markers b/n individuals and populations Genetic variation: in response to environmental conditions Forms of Evolution -Microevolution: small scale, focuses on one branch on the tree of life, individual species -Macroevolution: large scale, huge phylogenies 3 Levels of Genetic Diversity Individual loci -> chromosomes->organisms (Hardy-Weinberg) Within population variation (Hardy-Weinberg)
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This note was uploaded on 01/22/2012 for the course LS 1 taught by Professor Thomas during the Spring '05 term at UCLA.

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Lecture Notes Lec - Lecture Notes Lec. 4 Natural Selection:...

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