Genetics of Organisms

Genetics of Organisms - GeneticsofOrganisms...

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Genetics of Organisms by Theresa Knapp Holtzclaw Introduction In this laboratory you will study the patterns by which physical characteristics are transmitted from generation to  generation. By breeding fruit flies (Drosophila melanogaster) of unknown genetic composition and studying the traits  and ratios seen in their offspring, you will determine whether a trait follows a monohybrid or dihybrid pattern of  inheritance and whether it is sex-linked or autosomal. You will use statistical analysis to support your conclusions. Key Concepts We say that like comes from like, but offspring do not always look exactly like their parents. In this laboratory you may  breed two parent flies with red eyes and get some offspring with sepia (deep brown) eyes. How is this possible? In the nineteenth century Gregor Mendel discovered the principles of inheritance through a series of careful  experiments with peas. We know now that physical characteristics are transmitted from generation to generation  according to some general patterns. When we have sufficient information about the parents, we can predict the  occurrence of traits in offspring. And by analyzing the offspring, we can discern the mode of transmission —  monohybrid or dihybrid, sex linked or autosomal. To do this laboratory, you are expected to understand basic Mendelian genetics and chi-square analysis. If any of the  following concepts are unclear to you, review the genetics section in your textbook before continuing: Genotype, phenotype Parental generation, F 1 , F 2
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Monohybrid cross, dihybrid cross Sex-linked traits Crossing over, linked genes Punnett square Design of the Experiment How to Tell the Males from the Females The first thing you must do in this laboratory is learn to distinguish male fruit flies from female fruit flies. As illustrated in the figures above, female flies generally have a long, pointed, lightly striped abdomen. The male 
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This note was uploaded on 10/24/2010 for the course BIOL 2107 taught by Professor Brookshire during the Summer '08 term at Kennesaw.

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Genetics of Organisms - GeneticsofOrganisms...

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