A Study Of Inheritable Traits In Fruit Flies

1634 words - 7 pages

A Study Of Inheritable Traits in Fruit Flies


The Drosophila melanogaster, more commonly known as the fruit fly, is a
popular species used in genetic experiments. In fact, Thomas Hunt Morgan began
using Drosophila in the early 1900’s to study genes and their relation to
certain chromosomes(Biology 263). Scientists have located over 500 genes on the
four chromosomes in the fly. There are many advantages in using Drosophila for
these types of studies. Drosophila melanogaster can lay hundreds of eggs after
just one mating, and have a generation time of two weeks at 21°C(Genetics:
Drosophila Crosses 9). Another reason for using fruit flies is that they mature
rather quickly and don’t require very much space. Drosophila melanogaster has a
life cycle of four specific stages. The first stage is the egg, which is about .
5mm long. In the 24 hours when the fly is in the egg stage, numerous cleavage
nuclei form. Next, the egg hatches to reveal the larva. During this stage,
growth and molting occur. Once growth is complete, the Drosophila enter the
pupal stage, where it develops into an adult through metamorphosis. Upon
reaching adulthood, the flies are ready to mate and produce the next generation
of Drosophila melanogaster.
During this experiment, monohybrid and dihybrid crosses were conducted
with Drosophila melanogaster. Our objective was to examine the inheritance from
one generation to the next. We collected the data from the crosses and analyzed
them in relation to the expected results.


For the monohybrid cross in this experiment, we used an F1 generation, which
resulted from the mating of a male homozygous wild-type eyed fly with a female
homozygous sepia eyed fly. Males and females are distinguished by differences in
body shape and size. Males have a darker and rounder abdomen in comparison to
females, which are more pointed. Another difference occurs on the forelegs of
the flies—males have a small bump called sex combs. At week 0, after being
anaesthitized by fly-nap, three males and three females were identified under a
dissecting microscope and placed in a plastic vial with a foam stopper at the
end. The vial remained on it’s side until the flies regained consciousness so
that they didn’t get trapped by the culture medium at the bottom. We allowed
the Drosophila to incubate and reproduce for a week. After one week, the vial
contains many larva in addition to the F1 generation flies. Next, we removed
the F1 generation flies to prevent breeding between the two generations. Acting
as Dr. Kevorkian, we gave the F1 generation a lethal dose of the seemingly
harmless anesthesia, fly-nap. A trumpet solo of "Taps" played in our minds as
we said goodbye and placed them in the fly morgue. We allowed the F2 larval
generation to incubate for two weeks. The experiment called for one week of
incubation, but Easter fell during that week which interfered with our lab...

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