A Study Of Inheritable Traits In Fruit Flies

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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.

MATERIALS AND METHODS

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 ...

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homozygous for sepia eyes and
vestigial wings. The results of this cross were recorded and appear in Table 2.

RESULTS

The monohybrid cross of Drosophila melanogaster produced 25,893 flies for all of
the sections combined. Of those flies, 75.9% had wild-type(red) eyes, and 24.1%
had mutant(sepia eyes). Overall, more females were produced than males.

TABLE 1: F1 Generation Monohybrid Cross of Drosophila melanogaster (+se x +se)
PHENOTYPE CLASS RESULTS RESULTS
FROM ALL CLASSES NUMBER
PERCENT RATIO NUMBER PERCENT RATIO
MALES
WILD-TYPE EYES 562 74.8% 3.0
8,960 ...

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