Maury Matos 1/14/02 AIM: Find out the mode of inheritance from crossing brown big eyed male and little eyed female, and to find out the and genotype of offspring. I took the F 1 data and crossed it with another group to find the F 2 data. Hypothesis: I think that the red eyes have dominant traits over brown eyes, and big eyes have dominant traits over little eyes. I got to this hypothesis because the F 1 data proves that red big eyes are dominant because the offspring have big red eyes then the traits of red eyes and big eyes had to be homozygous dominant. Materials: 1.
Flies 2. Vials 3. Fly food 4. Ether 5.
Q-tip 6. Microscope Procedure: 1. Gather Materials. 2. Take empty vial and place all the flies in empty vial. 3.
Put ether in vial to put them to sleep. 4. When they are asleep put them under a microscope to observe them. Data: Male Female Brown big eyes - 0 Brown big eyes - 0 Brown little eyes - 0 Brown little eyes - 0 Red big eyes - 134 Red big eyes - 122 Red little eyes - 0 Red little eyes - 0 AB Ab aB a bab aAbB a Abb aabB a abb (prediction) Male Female Brown eyeless - 12. 5% Brown eyeless - 12. 5%Brown big eyes - 12.
5% Brown big eyes - 12. 5%Red big eyes - 12. 5% Red big eyes - 12. 5%Red eyeless - 12.
5 % Red eyeless - 12. 5% (outcome) Male Female Brown eyeless - 35 Brown big eyes - 33 Brown big eyes - 29 Brown eyeless - 25 Red big eyes - 32 Red big eyes - 26 Red eyeless - 32 Red eyeless - 28 Conclusion: My hypothesis was correct, because I crossed the F 1 data and came with the outcome. I guessed that red eyes and big eyes had dominant traits. When flies are crossed they gotta have their parents genes and in this case the parents genes. One parent has to be homozygous dominant and another has to be homozygous recessive. Then that means the F 1 offspring have heterozygous dominant traits.
I decided to cross the F 1 flies with brown eyeless flies. And I guessed that the results would be 12. 5% and the outcome came out to prove my prediction.