76 yellow & starchy, and 39 yellow & sweet.

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Presentation transcript:

A large ear of corn has a total of 500 kernals, including 312 purple & starchy, 73 purple & sweet, 76 yellow & starchy, and 39 yellow & sweet. HYPOTHESIS: This ear of corn was produced by a dihybrid cross (PpSs X PpSs) involving two pairs of heterozygous genes resulting in a theoretical (expected) ratio of 9:3:3:1. Test your hypothesis using Chi-square and probability values. SHOW YOUR WORK!

TOTAL = 500 offspring IF 9:3:3:1 then expect: H0- There is no difference between the frequencies observed and the frequencies expected for a HETEROZYGOUS DIHYBRID (9:3:3:1) cross. TOTAL = 500 offspring IF 9:3:3:1 then expect: Purple & Starchy = 500 X 9/16 = 281.25 Purple & Sweet = 500 X 3/16 = 93.75 Yellow & Starchy = 500 X 3/16 = 93.75 Yellow & Sweet = 500 X 1/16 = 31.25 312 73 76 39 281.25 93.75 31.25 30.75 -20.75 -17.75 7.75 945.56 430.56 315.06 60.06 517.56 3.36 4.59 1.92 13.23 4-1= 3 13.23 is larger than 7.82 REJECT THE NULL There is a difference between observed and expected for 9:3:3:1 = NOT A 9:3:3:1 cross