on Monday, December 21st, 2015 9:15 | by Amelie Roedel
In the following graph you see the final results of the trials done to investigate the genetic background of different wildtype lines.
on Monday, December 14th, 2015 12:05 | by Amelie Roedel
on Thursday, December 3rd, 2015 11:01 | by Amelie Roedel
I plotted every genotype seperately as a dot plot (Figure 1 – 5).
Figure 6 shows the results of the trials for the different WT lines.
on Monday, November 23rd, 2015 2:43 | by Amelie Roedel
on Thursday, November 12th, 2015 9:31 | by Amelie Roedel
on Friday, November 6th, 2015 11:33 | by Amelie Roedel
I tested the crossbreedings I did to test how flies behave according to light at different temperatures. The controls I use for this project are WTB x ShiTS, Gr28b.d(X) x WTB and WTB. For the TrpA1 flies I use WTB x ShiTS and TrpA1 x WTB. The genotypes that are supposed to show the change in the behavior are Gr28b.d(X) x ShiTS and TrpA1 x ShiTS.
As the flies do not behave as they are supposed to (see figure 1 & 2), I’ll start testing the genetic background of different wildtypes to see if that has something to do with the wrong change in the behavior.
on Friday, September 11th, 2015 8:36 | by Amelie Roedel
Using the Wildtype Berlin line of Drosophila melanogaster, I started to examine how flies behave to light while being confronted with different temperatures (4 °C, 14 °C, 25 °C, 32 °C, 37 °C).
The apparatus I use to test the temperature impact on light preference is the T-Maze.
One day before the trials, I clipped off the wings of about 30 – 40 flies under CO2 and put them in a vial together with 30 – 40 flies with wings.
The intervals for the T-Maze are 15 minutes of temperature adaption, 10 minutes of darkness adaption, 30 seconds in the elevator and 30 seconds to choose between darkness and light.
In the rooms with the extreme temperatures of 4°C and 37°C, I had to check if they survive for the spell of time I wanted to test them (~ 26 minutes). In the room with the temperature of 4°C the flies didn’t survive longer than 3 minutes. So I tried to do a T – Maze with a 1 minute adaption for temperature, 1 minute adaption for darkness and again 30 seconds in the elevator and 30 seconds to choose between light and darkness. But the result was not evaluable because the flies didn’t move. So we agreed on not going on with this trial.
In the room with the temperature of 37°C the flies survived perfectly.
After having eight trials for each room, I evaluated the data with “InfoStat” (see figure 1 & 2). The flies without wings went to the darkness and the ones with wings went to the light. In the room with the temperature of 37°C the results were not as we expected (expected Choice Index = 0). I tested them again, but it remained the same. After realizing that the intensity of light could influence the behavior I measured the lux in the different rooms to see if that was a reason for the unexpected results. But even after controlling the intensity of light in all the rooms the behavior didn’t change (see figure 1 and 2).
We decided to retest the flies. I took eight vials holding ~ 40 flies with wings and ~ 40 flies without and tested them in the room with the temperature of 25°C. After the trial I gave them approximately 5 hours to recover from the CO2 treatment and I reused them for the trial in the room with the temperature of 37°C. The result was the same (see figure 3).
We decided to try what would happen if I gave them more time to choose between light and darkness. Now the behavior changed (see figure 4; 3 minutes to choose between light and darkness, “Slow Phototaxis”).