03_Genes & Behavior

03_Genes & Behavior - Genes and Behavior Overview 1 2 3...

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Genes and Behavior Overview 1. Definition of a gene 2. How do genes determine phenotypes? 3. What genes control behavior? 4. Ethical implications 1
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A gene is a piece of DNA that is a unit of heredity, encoding a function 2
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Bacterium Haemophilus influenzae 1995 1.8 Mb(x10 6 bp) ~1700 genes Nematode Caenorhabditis elegans 1997 100 Mb ~13,000 genes Fruit fly Drosophila melanogaster 2000 180 Mb ~14,000 genes Human Homo sapiens 2001 3,200 Mb ~25,000 genes. The genome is all DNA in an organism 185 Genomes sequenced since 1995 3
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Human chromosomes-23 pairs Human genome = 1.5% protein coding 44% transposons rest repeat elements, ? An allele is one version of a gene, each person has two alleles of a gene 4
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From gene to protein
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Promoters determine where and when genes are expressed Transcription factors and activators bind promoters
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Genetic inheritance: Genotype controls phenotype Green is a single gene trait Cross of yellow pea plant to green pea plant G is dominant, g is recessive
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Gene evolution 1. Coding mutation 2. Non-coding mutation 3. Duplication 4. Re-arrangement 8
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This note was uploaded on 04/07/2010 for the course MCB 167 taught by Professor Feldman during the Spring '10 term at Berkeley.

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03_Genes & Behavior - Genes and Behavior Overview 1 2 3...

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