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F2 Phenоtype Observed Expected Tаll stems, purple leаves 570 Tаll stems, white leaves 185 Shоrt stems, purple leaves 190 Shоrt stems, white leaves 55 Total This table shows the F2 data from a typical cross of pea plants. The P generation cross was between a plant with tall stems and purple leaves and a plant with short stems and white leaves. The F1 all had tall stems and purple leaves. Your job is to do a Chi-squared Goodness of Fit analysis- this is a typical dihybrid cross with unlinked genes like Mendel would have performed. Do the calculations on a scratch paper and your calculator, then type your calculated numbers in the blanks in this question. Remember, you HAD to show your blank scratch paper to the screen before you started the exam. If you didn't, do it NOW! What is the Expected # of tall steams with purple flowers (the first row)? _______ What is the expected # for the second row, tall stems white leaves? _______ What is the expected # for the third row, short stems with purple leaves? _______ What is the expected # for the fourth row, the short stems with white leaves? _______ Complete the calculation for the chi-square value and enter your X2 value it here, round to the nearest hundredth: _______ How many degrees of freedom are there for this experiment? _______
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