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Lacey Baker Bio Lab Section 006 6 December 2006 Title Studies on an Unknown Cross in the F1 Generation of Drosophila Introduction In this Genetics lab, we studied Mendelian Genetics through a common insect, normally regarded as a household pestthe fruit fly. Drosophila Melanogaster , the common or vinegar fruit not an agricultural pestbut a model organism. (Vieyra 5-1) It is very useful in experiments because it has a short life span, its cheap to buy and obviously very small. It is often used in the study of genetics because they only have four chromosomes, which makes it easy to see changes in the phenotypes, which are the physical attributes, because there are only a limited number of them. In addition, they live for over two weeks in the wild and up to six months in a lab. (Vieyra 5-1) They also reproduce very quickly. Males are easily distinguished from females based on color differences; males have a distinct black patch at the abdomen. (Wikipedia) My hypothesis for this experiment was that the chi squared test and the Punnett Square would show the F1 generation as heterozygous. In this experiment, we bred drosophila with unknown genotypes, which are the actual genes an organism, to see what the phenotype of their offspring would be. The F1 generation as well as the parent generations were unknown. The offspring that we studied from the F1 generation was the generations were unknown.... View Full Document

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