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2. Consider the following dihybrid testcross data: a_a_: 174 A bb: 77 aaB:73 aabb: 164 Phenotype Probability Observed (O) Expected (E) IO -EPVE Total What is the probability that the deviations are due to chance alone? Do the data support the hypothesis of a testcross ratio with independent assortment? Test whether each gene pair is behaving according to Mendels law of segregation?
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2. Consider the following dihybrid testcross data: A B: 174 A bb: 77 aaB 73 aabb: 164 O-E (O-E)2 52 2704 -45 2025 -49 2401 42 1764 Phenotype |Probability 1/4 1/4 1/4 1/4 bserved (O) | Expected (E) |[(О-E)VE 77 1/4 X 488122 16.59 164 1/4 x 488122 14.45 1_174 1/4 X 488-122-22. AB Ab aB ab 1/4 X 488 122 19.6 1 488-x7255 What is the probability that the deviations are due to chance alone? P value at 0.05 at degree of freedom 7.81 Do the data support the hypothesis of a testcross ratio with independent assortment? No. chi square>P value, it is not independent assortment. Test whether each gene pair is behaving according to Mendels law of segregation? The data cleary shows it not follows mendel laws. Test cross in mendel gives ratio 1: 1: 1:1. But here it not give that ratio.

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