Lecture2-23Jan

Lecture2-23Jan - 1 The Sounds of Science-Beastie Boys...

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Unformatted text preview: 1 The Sounds of Science-Beastie Boys Announcements: Announcements: • New slide color scheme • Clickers from other courses can be used • Register them at….. • Assignments: please read instructions • H-W Survey…… • Course e-mail, use this first! [email protected] • UTA’s: Erik Lavington, Steven Groene Evolution: Evolution:-A process A process – Occurs in populations, not Occurs in populations, not individuals. individuals. Natural Selection: Natural Selection:-A mechanism A mechanism – Acts on individuals, not Acts on individuals, not populations populations 2 Darwin Darwin ’s work answered some key s work answered some key questions questions …… …… but raised many but raised many others. others. • Explanation for patterns in nature? YES • Mechanism for change? YES •Source of variation? • Mechanisms of speciation? • Nature of inheritance? Inheritance of traits Inheritance of traits • Gregor Mendel {1822-1884}: – Experiments with pea varieties – Did not know about DNA – Discrete patterns of inheritance • Each locus: one allele from each parent Mom Dad Kid X Genetic material: review Genetic material: review Homologous chromosomes 1 gene locus, 2 alleles • Chromosome: strand of DNA Chromosome: strand of DNA – Diploid organisms: Diploid organisms: chromosomes in homologous chromosomes in homologous pairs pairs • Gene locus: Gene locus: – Specific place on a chromosome Specific place on a chromosome – Codes for a trait Codes for a trait • Allele: Allele: – Alternate forms of a gene Alternate forms of a gene 3 A locus is a specific chromosomal region (where a gene occurs) A gene is a discrete hereditary unit (DNA). Alleles are the alternate DNA sequences at a particular locus (alternate versions of the gene) TTTGATGTCTTCA T CCATCACTGTCCTT TTTGATGTCTTCA G CCATCACTGTCCTT Genotype Genotype • Individual’s genetic composition Homozygote: Two identical alleles Heterozygote: Two different alleles • Visible characteristics of an individual – Interaction of genotype & environment • Some loci:...
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This note was uploaded on 04/30/2008 for the course BIO 152 taught by Professor Mort during the Spring '08 term at Kansas.

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Lecture2-23Jan - 1 The Sounds of Science-Beastie Boys...

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