Before the 1920’s, it was assumed that the circadian sleep wake cycle was controlled by external factors, however post 1920’s, it was suggested that biological rhythms are controlled by an internal clock (endogenous pacemaker). Richter (1922) looked at ground squirrels and their hibernation cycles, and he kept them in conditions where a constant temperature was maintained and observed them. He found that the ground squirrels continued to hibernate, and these findings suggested that an internal biological clock must be responsible for the cycle of hibernation. This research challenged the view that biological rhythms are controlled by properties of the world, and it led to more research being done. After proving the existence of an endogenous pacemaker, research was done into its location.
In this lab, black widow spider’s courtship behavior under the presence and absence of other males was the subject of interest. We tested the hypothesis that courtship is influenced by the presence of other males. We predicted that courtship in the presence of other males will be higher than in the absence of males. METHODS Black widow spiders were observed during a 30 minute period. Individual observations were obtained from different groups in the classroom, each observing the courtship of one spider at a time.
This wasp has two pairs of wings and an ovipositor on the female. The wings of the trichogramma differ from the typical membranous winged moth, as the trichogramma wings are short with long fringy hairs. Regardless of its small size, this parasitic wasp is a professional destroyer of the eggs of over 200 species of leaf-eating moths and butterflies. During the course of the female’s 10-day life, she seeks out potential host eggs, to lay her own eggs in, by picking up their scent. Once a suitable host egg is found, she measures the egg with her antennae to determine how many eggs of her own she can lie inside.
Introduction: Sow Bugs, small land crustaceans, have oval bodies with armor like plating, live in humid and cool environments such as logs and leaf litter, and are chosen to be used to test for taxis, movement towards or away from a stimulus. Both chemotaxis, movement in response to chemicals, and phototaxis, movement in response to light, are tested in this experimental procedure. The purpose of this experiment is to test the response of Sow Bugs to a light and a chemical source, showing whether they exhibit taxis to a certain stimulus. Body spray was used because it exhibited all the attributes of a potential chemical substance. It has color and smell and being in a liquid and a gas form.
Megan Woodby March 6, 2014 Analysis of the Pollinator Shift Model In the journal article, "Pollinator Shifts Drive Increasingly Long Nectar Spurs in Columbine Flowers" by Justin B. Whittall and Scott A. Hodges, the theories of Darwin's coevolution race model and the pollinator shift model are compared and contrasted. The article begins by dissecting the differences in each theory with the emphasis on the pollinator shift model. The coevolution theory suggests that both moth tongues and plant spurs developed simultaneously, while the pollinator shift model suggests that the pollinators' tongues developed first before the plant spurs caught up evolutionarily. One of Whittall's main explanations for why the pollinator shift likely occurred is because short tongued pollinators will not interbreed with the long to short spurred plants. The way Whittall came to this conclusion was through phylogenic analysis between the spur lengths of different plants throughout their evolutionary history.
Ants who are threatened release a chemical into the air warning others in the colony of danger. This chemical, called an alarm pheromone, is sensed by soldier ants who rush to defend the colony. How do they know where to go? They follow “up” the concentration gradient of the pheromone, a path which leads them to the danger. Pheromones are also used in attracting a mate.
The first petri dish we placed under the microscope at 37x was the one containing wild-type hermaphrodite offspring. The Next crosses that we experimented with were wild-type males with sma-9 hermaphrodites. Taking the worm-pick, and putting it in the flame ensured that it was sterile to use in the petri dish with the worms. Then, using that tool under the microscope, we picked out some worms that were in the L4 stage of development (shown in Diagram 1), both hermaphrodites and wild-type males and placed them in a completely new petri dish to determine offspring. They were quite small and were such a high number of them in the prepared petri dishes, roughly 500 in each.
Problem After examining the mealworms, my lab group came up with many different experimental problems to test on the mealworms. Ultimately, we decided to test if the mealworms preferred staying in the dark or in the sunlight. Research Mealworms are actually not worms. They are the larval stage of darkling beetles. Darkling beetles are also referred as Tenebrio beetles.
In the myth Kwaku Anansi , the spider wished to own all stories and tales told no matter the price . The sky God Nyame offers to sell the stories but not for an easy bargain , the sky God tells Anansi that the price he ask for will be one that not even rich and powerful have been able to accomplish but Anansi wishes to anyway. Nyame then proceeds to tell Anansi the three almost impossible task which was to have Mmoboro the hornets , Onini the great Python , and Osebo the leopard. Anansi agreed to bring him all three things and so he started right away on his task immediately . Anansi brought each of the things back to Nyame one by one .
Once the intruder knows the machines that are alive or not, they can begin to focus on what machines to attack. A network administrator may have legitimate reasons to perform a ping sweep for diagnostic purposes. A tool used for implementing a ping sweep is fping. fping works by taking a list of IP addresses and sends packets to each of them, one ping packet to one IP address,