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Objectives

Objectives. Evaluate models that illustrate the origin of variation in a population. Last time: What are the sources of genetic variation?. What are the sources of new alleles and new combinations of alleles in a population of snails? Random mutation; Sexual reproduction;

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Objectives

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  1. Objectives • Evaluate models that illustrate the origin of variation in a population.

  2. Last time: What are the sources of genetic variation? What are the sources of new alleles and new combinations of alleles in a population of snails? Random mutation; Sexual reproduction; Crossing-over in meiosis; Gene flow.

  3. Last time: Modeling the origin of variation In your groups: Model the origin of variation for one of the traits you observed in the snails. Make your model context-specific. • What structures should you include? • What is the function of this model? Turn in your work (one model per group)

  4. Origin of variation Time 1 Time 2

  5. Gene 2 DNA molecule Gene 1 Gene 3 Fig. 17-4 DNA template strand TRANSCRIPTION mRNA Codon TRANSLATION Protein Amino acid

  6. Wild type 3 5 DNA template strand 5 3 5 3 mRNA Protein Fig. 17-23b Stop Amino end Carboxyl end T instead of C 5 3 5 3 A instead of G 3 5 Stop

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