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INTRODUCTION The Drosophila melanogaster more commonly known as the fruit fly is apopular species used in genetic experiments In fact Thomas Hunt Morgan began usingDrosophila in the early 1900s to study genes and their relation to certainchromosomesBiology 263 Scientists have located over 500 genes on the four chromosomesin the fly There are many advantages in using Drosophila for these types of studiesDrosophila melanogaster can lay hundreds of eggs after just one mating and have ageneration time of two weeks at 21CGenetics Drosophila Crosses 9 Another reason forusing fruit flies is that they mature rather quickly and dont require very muchspace Drosophila melanogaster has a life cycle of four specific stages The first stageis the egg which is about 5mm long In the 24 hours when the fly is in the egg stagenumerous cleavage nuclei form Next the egg hatches to reveal the larva During thisstage growth and molting occur Once growth is complete the Drosophila enter the pupalstage where it develops into an adult through metamorphosis Upon reaching adulthood theflies are ready to mate and produce the next generation of Drosophila melanogaster During this experiment monohybrid and dihybrid crosses were conductedwith Drosophila melanogaster Our objective was to examine the inheritance from onegeneration to the next We collected the data from the crosses and analyzed them inrelation to the expected resultsMATERIALS AND METHODS For the monohybrid cross in this experiment we used an F1 generation which resulted fromthe mating of a male homozygous wild-type eyed fly with a female homozygous sepia eyedfly Males and females are distinguished by differences in body shape and size Males havea darker and rounder abdomen in comparison to females which are more pointed Anotherdifference occurs on the forelegs of the fliesmales have a small bump called sexcombs At week 0 after being anaesthitized by fly-nap three males and three females wereidentified under a dissecting microscope and placed in a plastic vial with a foam stopperat the end The vial remained on
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