Chapter 8b - Chapter 8 Bacterial Genetics and Genetic...

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Chapter 8 Bacterial Genetics and Genetic Transfers
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Eukaryotes undergo sexual reproduction during which chromosomes are segregated and random fertilization occurs Gametes have various genetic combinations Prokaryotes reproduce only be asexual means All offspring are clones of parent cell Genetic Diversity
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Diversity in Bacteria Bacteria use three different mechanism to adapt to changing environments Mutation Gene transfer Regulation of gene expression
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Vertical gene transfer Horizontal gene transfer Types of Genetic Transfer Occurs during reproduction, between generations of cells Transfer of genes between cells of the same generation
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Change in the genetic material (genotype) may or may not cause phenotypic changes Changes may be neutral, beneficial, or harmful Changes are passed vertically to all offspring Natural Selection Antibiotic resistance Mutations
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Mutagen Agent that causes mutations Radiation, chemicals Spontaneous mutations Occur in the absence of a mutagen May be due to error or transposons
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Transposons Segments of DNA that move spontaneously from gene to gene Transposons may disrupt proper function of gene All contain insertion sequences for cutting and resealing DNA (transposase) Complex transposons carry other genes
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This note was uploaded on 02/21/2008 for the course BIOLOGY 380 taught by Professor Littlejohn during the Spring '06 term at University Of Southern Mississippi .

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Chapter 8b - Chapter 8 Bacterial Genetics and Genetic...

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