AP Lab Seven Genetics of Organisms Dan Torres AP Biology Block 1 January 24‚ 2011 Introduction & Background Fruit flies have made a huge contribution towards knowledge about genetics‚ but for most people‚ they are just annoying insects that are attracted to their fruit. Their scientific name is Drosophila melanogaster‚ and to scientists‚ they have been a key to understand many principles of heredity including sex linked inheritance‚ epistasis‚ multiple alleles‚ and gene mapping. Fruit
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A2 BIOLOGY CORE PRACTICAL SUMMARY Name of practical Independent & dependent variables Observing patterns by Ecological sampling Random sampling Systemic sampling Other variables to be controlled Abiotic factors e.g. light‚ temperature‚ soil water‚ humidity‚ O2 concentration‚ pH‚ aspect‚ slope angle equipment Gridded Quadrat Tape measure Point quadrat Pitfall trap Sweep Net Pooter Tullgren funnel Baermann funnel Method and outcome Several methods. 1 random sampling = set up grid using
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Effects of Alcohol‚ Caffeine‚ and Temperature on the Heart Rate of Daphnia magna Joseph Ezra Gallo BY124L MW 8:30-11:30 Introduction Ectothermic animals are animals whose body temperature is affected by their surroundings. This means that if the environment is cold the animal will be cold. If the environment is warm the animal will be warm. This is because the animal doesn’t have the capability of regulating its body systems to keep a constant body temperature. When an ectothermic animal is
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Introduction “The consumption of oral creatine monohydrate has become increasingly common among professional and amateur athletes” (Poortmans and Francaux‚ 2000). Creatine is a substance used by athletes and bodybuilders to increase the production of Adenosine Triphosphate (ATP)‚ which gives them the energy they need to perform. In this experiment‚ creatine is added to water and its effects on Daphnia is tested. By observing the heart rate‚ one can determine if the creatine increases or decreases
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gloves and eyewear. Next we gathered all our materials and that includes two Petri dishes‚ universal indicator‚ apple with skin‚ plastic bottle
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for a small amount of the ecoli bacteria to be poured into the agar (after all even just one single microorganism can reproduce into a full colony). Once the bacterium is grown to its full potential the broths will be swabbed into Petri dishes with agar in them. The Petri dishes will be given time for the bacteria to grow. If the bacteria grows in any of the dishes it will be swabbed and placed into a new
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pencil lettuce seeds water hand lens Suggested Procedure: 1. Fold a paper towel in half. Fold it in half again. Place the bottom half of a dish in the center of the folded towel. With a pencil‚ trace the bottom of the container onto the folded paper towel. Cut out circles. Insert all the paper circles in the bottom half of the petri dish. 2. Using the same procedure‚ cut paper circles and place them in the other three containers. 3. Label the bottom of one container “lettuce.” Label
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Discussion: 6. The ph solutions that were used were 2‚4‚7‚9 and 10. All of these solutions affected the beetroot‚ but the most acidic solutions were the ones that did the most damage to the membrane. This is because the ph affects the proteins within the phospho lipid bi-layer. The acidic ph breaks the hydrogen bonds therefore denaturing the proteins and allowing beetroot pigment to secrete form the cell. 7. The ethanol solutions that were used were 11%‚ 25% and 50% ethanol. The beetroot cell
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These medical disparities even start before the drugs even get to trial‚ “gender discrimination isn’t only a problem in clinics‚ it’s an issue in petri dishes.”3 Scientists have recently discovered that all human cells have different characteristic based on sex. When drugs are in the early stage of petri dish trials‚ they are tested on samples that are classified based on cancer type‚ with no consideration of the cell differentiation caused by sex in particular. This bias against
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Diffusion on Substances Lunar-maius A. Gaerlan Group 2 Sec. X – 9l August 15‚ 2012 ABSTRACT The effect of molecular weight on the rate of diffusion was assessed using agar-water gel test. The agar-water gel set up was composed of a petri dish of agar-water gel containing three wells. Drops of potassium permanganate (KMnO4)‚ potassium dichromate (K2Cr2O7) and methylene blue(C16H18N3SCl) were simultaneously introduced to each well. Methylene blue‚ having the largest molecular weight‚ displayed
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