Fruit flies

Drosophila melanogaster A Lab Write up utilization: In this experiment, Drosophila melanogaster (fruit fly) were used to observe genetic crosses. data was placid from an unknown F1 contemporaries, and the results of the F2 geneproportionn were used to determine the genotypes and phenotypes of both the F1 and related geneproportionns. The F1 generation of A flies was concluded to be heterozygous for eye color bolshy dominant over recessionary allele sepia- and the p arntal generation was determined to be homozygous. The phenotype ratio of the F2 generation was 3:1 with a 75% demote of red eyes and 25% chance of sepia eyes. The genotype ratio was concluded to be 1:2:1: 25% pure-breeding for the dominant trait, 50% hybrid for the two traits, and 25% pure-breeding for the recessive trait. Procedure: 1.Make a habitat for the flies by obtaining an empty vial, foam, and plastic net. Mix a scoop of the unmitigated food medium with a scoop of water. 2.Obtain a Petri di scus of A flies and immobilize the flies by placing the Petri suffice in the freezer for go legal proceeding. 3.Determine the sexual rede of the flies (sexing) by looking at the following characteristics immaculate and through a stereoscope. Males are usually smaller than females. Males put on dark, candid abdomens, and females shake off lighter, pointed abdomens.

Only the males have sex combs, which are groups of downhearted bristles on the uppermost joint of the forelegs. If the flies elicit up during this process, place the Petri dish back into the freezer for ten minutes or until they become immobile. 4.While sexin g, examine the phenotypes of each buy the ! farm: eyes, wings, bristles and antennae. 5.Obtain eight flies (4 males, 4 females), and place them in the vial. 6.During the freshman week, periodically watch the flies and journal either observations. archive the mating behavior, mutations, and life cycle of the flies. (Steps one through sixer were completed by Mrs. DeYoung; details were provided in the packet). 7.When the F2 flies have emerged,...If you want to get a full essay, arrangement it on our website: BestEssayCheap.com

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