Genetic Predictions in the Fruit Fly

Good Essays
Kayla Berezne
Mrs. Cohen
Honors Biology
24 March 2013
Genetic Predictions in the Fruit Fly The Drosophila melanogaster is a fruit fly with a very short life cycle. They can be winged or wingless, and have red eyes or white eyes. The different options are called alleles. Alleles are the variants of a specific gene, and one is received from each parent on each chromosome. (“What Are Dominant and Recessive?”). It was chosen to use winged females and wingless males to predict the offspring in this experiment. The winged allele is dominant, meaning it only needs one allele to physically appear. The wingless allele is recessive, which gets covered up by the dominant allele (“Fruit Fly Genetics”). Each trait has two alleles in the flies’
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15) Bring the flies to the morgue (the bowl of isopropyl alcohol) to kill them.
16) After another week (day 14) the F₁ generation flies will hatch from their larva. Anesthetize them by repeating steps 10-14.
17) Observing the flies under a microscope, record the genders of the flies and the phenotypes that was chosen to study (the notecards and paintbrush may be helpful to do this).
18) Create a new vial with food by repeating steps 3-5.
19) Collect 5 males and 5 females of the F₁ generation and place them in the vial to become parents of the F₂ and seal it with another plug.
20) Dispose of the rest of the flies in the morgue.
21) In the next few days, continue to anesthetize and count the F₁ generation flies in the original vial.
22) After the flies have been counted, discard them in the morgue so they are not counted the next day.
23) On day 21 (three weeks from the start date) finish counting the F₁ flies.
24) Also, anesthetize and remove the adults in the second vial so they do not mate with their children.
25) On day 28, anesthetize, count, and record the phenotypes of the F₂
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