Answer Happy

The International Rice Research Institute in the Philippines devlops new lines of rice which combine high yields with resistance to disease and insects. The technique involves crossing different lines to get a new line which has the most advantageous combination of genes. Detailed genetic modeling is required. One project involved breeding new lines to resist the brown plant hopper" (an insect): 374 lines were raised, with the results shown below. Number of lines All plants resistant Mixed: some plants resistant, some susceptible 184 All plants susceptible 93 According to the IRRI model, the lines are independent: each line has a 25% chance to be resistant, a 50% chance to be mixed, and a 25% chance to be susceptible. Are the facts consistent with this model? 97 a. Which of the following represents the null hypothesis? i. The categories of lines are independent. il. The categories of lines are not independent. b. What is the expected frequency for each category? (Round answers to the nearest 0.1) i. Resistant ii. Mixed iii. Susceptible c. The number of degrees of freedom for this test is df = d. The value of the test statistic is x2 = (round to the nearest 0.01). e. Here P = 30%-50% f. What is your conclusion? Answer: (11) i. The evidence proves that the lines are independent. ii. The evidence is consistent with the model ii. The evidence is not consistent with the model.