Practice this Genetic Problem • Mendel's experiment on crossing pea flower with purple and white produced all purple as F1. He again bred two F1 purple. He observed 733 purple flower pea plants and 267 white flower pea plants. With our current knowledge of F2 phenotypic ratio of 3:1, does the outcome of Mendel's experiment coincides with the expected ratio? • You can use pen and paper and ready your calculator. • You can use the table format. Expected: Total number X Probability Ratio Purple : 1000 x (3/4) = 750 White : 1000 x (1/4) = 250 Phenotype Observed Expected Purple 733 750 White 267 250 E 10-E E *TRY TO ANSWER IT FIRST! *ANSWERS are in White Color, to see Highlight the last column • There are two phenotypes so the df = 1, let us use the 0.05 significance level so the critical value is 3.84 •Is the computed Chi square value lesser than or greater than 3.84 • If you got greater value, try to practice it again • If you got lesser, you are correct! So we can say Mendel's experiment agree with the ratio of 3:1 QUESTION : 1. A researcher transferred two hybrid Red color fishes, from a pure line Red color fish as dominant and pure line White color fish as recessive, in a large aquarium for breeding purposes. After few months, fingerlings were seen inside the aquarium, however, two colors of the fishes were observed. The researcher counted the fingerlings and obtained 133 red color fishes and 38 white color fishes. The researcher did not know if the result followed the Mendelian genetic ratio of 3:1? a.) With the given problem, compute the chi square value. Show your solutions. b.) Does the result follow the ratio of 3:1 at 0.05 significance level? Why or why not?