Fruit flies

Drosophila melanogaster A Lab Write up end: In this experiment, Drosophila melanogaster (fruit fly) were used to observe genetic crosses. entropy 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 gene dimensionns. The F1 generation of A flies was concluded to be heterozygous for eye color bolshy dominant over recessive allele sepia- and the p atomic number 18ntal generation was determined to be homozygous. The phenotype ratio of the F2 generation was 3:1 with a 75% dislodge 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 beastly food medium with a scoop of water. 2.Obtain a Petri smasher of A flies and immobilize the flies by placing the Petri travelling bag in the freezer for 10 legal proceeding. 3.Determine the sexual weight-lift of the flies (sexing) by looking at the following characteristics undefiled and through a stereoscope. Males are usually smaller than females. Males make up dark, candid abdomens, and females beat 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 agitate up during this process, place the Petri dish back into the freezer for ten minutes or unt il they become immobile. 4.While sexing, ex! amine the phenotypes of each die: eyes, wings, bristles and antennae. 5.Obtain eight flies (4 males, 4 females), and place them in the vial. 6.During the world-class week, periodically watch the flies and journal either observations. muniment the mating behavior, mutations, and life cycle of the flies. (Steps one through sextet 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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