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PROBABILITY LAB How does chance affect the combination of alleles Hypothesis Which combination of beans (alleles) will occur must often? ____________________________________________ Procedure Answer: 1. 2. 3. Obtain one male bag and one female bag. Make certain that there is 50 red and 50 white beans in each bag. These bags represent the P1 generation. What is the genotype of these parents P1 : _______ x _______ 4. Use a Punnett square below to predict the ratio of Red/Red, White/White, Red/White genoptypes combinations will be selected. Use ‘R’ to represent the Red Bean phenotype. Use ‘W’ to represent the White Bean phenotype. 5. 6. 7. Take one bean out of each bag and tally results in ‘Data’ section below. Place the two gametes back in their respective parents’ bag. Shake the bag again and repeat so you have 100 entries in your data. Data Table Beans Group Tally Marks Group Total Class Total R/R R/W W/W Questions 1. Which genotype combination occurred most often in the experiment? 2. If red is dominant and white is recessive, how many plants have a dominant phenotype? 3. How did your predicted results of selected combinations compare with your actual results? 4. Which of the ratios produced the closest results, the ‘Group’ or the ‘Class’ totals? 5. What is the probability of selecting the same color in a pair of alleles each time? 6. How does chance affect allele combination?
