Essay on A Study of Inheritable Traits in Fruit Flies

1696 Words Sep 27th, 1999 7 Pages
A Study Of Inheritable Traits in Fruit Flies

INTRODUCTION

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
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54.9% of the flies had wild-type eyes(red) and wild-type wings(full),
17.7% had wild-type eyes and vestigial wings, 21.3% had sepia eyes and full wings, and 6.1% had sepia eyes and vestigial wings. Again, the number of females produced exceeded the number of males.

TABLE 2: F1 Generation Dihybrid Cross of Drosophila melanogaster(+vg+se x
+vg+se)
PHENOTYPE CLASS RESULTS RESULTS FROM ALL CLASSES
MALES NUMBER PERCENT RATIO NUMBER PERCENT RATIO WILD-TYPE EYES WILD-TYPE WINGS 244 47.8% 6.3 6987 54.4% 8.6 WILD-TYPE EYES VESTIGIAL WINGS 132 25.9% 3.4 2315 18% 2.9 SEPIA EYES WILD-TYPE WINGS 95 18.6% 2.4 2727

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