14 lecture final

14 lecture final - Genetics: Why do offspring of different...

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1 Genetics: Why do offspring of different parents look different? The role of hereditary differences Mendelian or particulate inheritance theory A fruit fly heterozygous for the gene “ Amy” mates with a fly that has two copies of the Amy 1 allele in its genotype. (This allele occurs in both flies.) How many different genotypes could be found in their offspring? A. 1, B. 2, C. 3, D. 4 Survey Question Genetic differences hypothesis: Genetic differences are responsible for differences in appearance between people. Identical twins Fraternal twins Oak leaves and catkins Adult moth Twig mimic form Catkin mimic form Another test of the genetic differences hypothesis
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2 CQ: Why do oak moth caterpillars differ in appearance? CQ: Why do oak moth caterpillars differ in appearance? H: Because they differ in their genes. CQ: Why do oak moth caterpillars differ in appearance? H: Because they differ in their genes. P: Caterpillars should resemble their parents (when their parents were caterpillars). CQ: Why do oak moth caterpillars differ in appearance? H: Because they differ in their genes. P: Caterpillars should resemble their parents (when their parents were caterpillars). T: Rear offspring of twig x twig adults and catkin x catkin adults in the lab, all with same food (oak leaves)
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3 CQ: Why do oak moth caterpillars differ in appearance? H: Because they differ in their genes. P: Caterpillars will resemble their parents (when their parents were caterpillars). T: Rear offspring of twig x twig adults and catkin x catkin adults in the lab, all with same food (oak leaves) = All offspring resemble twigs Conclusion = ? New hypothesis: Differences in environment (diet) cause the caterpillars to differ in looks P: Caterpillars reared on different foods will differ in looks Design an experiment to check the prediction Divide eggs laid by one adult female into two groups Group A feeds on catkins; Group B feeds on leaves If diet difference hypothesis is correct, Group A eggs should grow into catkin mimics while Group B eggs should grow into twig caterpillars.
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14 lecture final - Genetics: Why do offspring of different...

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