The mossback’s membranes stick to each other and begin to pile up until it’s so high that it tips over and forms a slug about 2-4 millimeters long. By doing this, the mixable have become a multi-cellular organism. The slug is capable of moving around, and that’s exactly what it does. The cells in the front of the social amoeba (posterior) secret a slime that helps the slug body move and glide around. The slug will move towards the light and once it is in the correct environment, the posterior end of the slug settles down and forms a stalk.
The ells that were once at the end (anterior) begin to climb up the stalk and form the “ball” at the top of the stalk where the cells become spores. This is called a fruiting body, and it quite resembles bread mold. From the fruiting body, the spores will be released into the environment where they will land elsewhere and begin to germinate into amoebae again. Our goal in the experiment was to see if having absolutely no light available to one Petri dish of slime mold would make a difference in the behavior of the slime mold in comparison to one that was exposed to a bit of light.
We hypothesized that the Petri dish that was exposed to a bit of light (experimental group) would have slugs that moved toward the direction of the light. We predicted that the Petri dish that was deprived of light (control group) would have no sense of direction and would therefore form slugs that move around in all directions and some of the mixable would die. METHODS In the first week of the experiment, we started by using microscopes to look at slime mold in different stages of development. These slime mold samples where maintained in a Petri dish that included some bacteria for the mixable to eat.
On the second week, we began conducting our experiment. On day 1 , we put the same amount of bacteria and slime mold on the side in each of the two Petri dishes. One became our control group, which went into a box that sealed off light completely, another became our experimental group, which we put into another box that let light in through a small hole on one side. RESULTS On day 2 we began to see changes. In both of the Petri dishes the mixable had begun sending out the chemical signals that instructed the other hexameter to gather, and we began seeing slugs that had formed.
In the experimental group, 10 slugs had formed; this number was the same in the control group. The slugs in the experimental group were formed in a way so that they had begun to move towards the light a bit. The slugs in the control group were formed heading towards any and all directions; there was no single direction that they all were headed towards. (See fig. 1 and 2) On day 3, the last day of the experiment, we noticed that the slugs formed in the experimental rope had doubled in number and the slugs that had started their journey on day 1 were halfway to the light.