Introducing
Your new presentation assistant.
Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.
Trending searches
The virtual representation of Drosophila melanogaster is studied for its genetic purposes in this lab. These fruit flies only have 4 chromosomes, so it is easy to see what hereditary changes occurs in them.
This lab begins with the simulation process of purchasing specifically characterized flies. It goes through the mating process to show just how these traits are passed down through generations. This information for the F1 generation and the F2 cross generation are then recorded onto charts. These observed values are used to generate expected values. These two sets of values are then used to develop a chi-square. This chi-square answer is what determines whether or not the null is accepted or not. The null for part 1 is the 3:1 ratio. For part 2, the ratio is the 9:3:3:1 ratio. The ratio in part 1 is rejected. The ratio in part 2 is accepted. Part 2 failed to reject the null and is therefore not correctly formulated. The data here is not significant enough to reject the null.
First order your flies (wild type females and white eyed males). Mate the flies. Sort the flies. Use these flies to fill out the data chart which identifies the flies' gender, phenotype, and number of each. Perform a corss between the members of the F1 generation. Record this information as well.
We can reject the null for part 1. We have to accept it for part 2.
On both parts, I expected the experiment to follow the Mendelian theory. Part 1 rejected the null while part 2 accepted it. This means i failed to have enough data to support part 2 and make it reject the null hypothesis. For example, in part 2, the chi-square value i got was 20.1172 which is well above what is rejected, meaning it must be some sort of mathematical error or there was not enough flies to get the correct number in which i could accept or reject the null properly.I believe the error would be in the calculations for the expected values of part 2 that gained this result. In the introduction the lab, it is said that because fruit flies only have 4 chromosomes, it is easy to model a Mendelian theory after them. That is why I chose the Mendealian theory to be my null.
Through this lab, we were able to see how to calculate the probablities of fruit flies inheriting certain characteristics, based on their mating. They provided an easy model that shows how genetics works on a much smaller, more simpler scale.