Paul

Dr. Mohamed

Biology 112

December 12, 2002

Abstract

Drosophila melanogaster were mated in labs 8, 11, and 13 to illustrate how the sex-linked genes are passed on from one generation to the next. This was accomplished by crossing different genotypes. In order to do this, the flies first had to be put to sleep, then counted under a dissecting scope and finally separated in to groups of red-eyed females, white-eyed females, red-eyed males, and white-eyed males. For the F1 a generation my results were 22 red-eyed males, 0 white-eyed males, 47 red-eyed females, and 0 white-eyed females. The expected ratio was 1:0:1:0, which was not far off from 1:0:1.2:0. The F1 b results are as follows: 0 red-eyed males, 20 white-eyed males, 37 red-eyed females, and 0 white-eyed females. The expected ratio was 0:1:1:0. The actual ratio was 0:1:1.7:0, this was a little farther off but I still accepted it. The results of the F2 a cross were 16 red-eyed males, 20 white-eyed males, 44 red-eyed females, and...