Let\'s assume that we are doing some plant breeding experiments. A dihybrid cros
ID: 2923728 • Letter: L
Question
Let's assume that we are doing some plant breeding experiments. A dihybrid cross tracks two traits. Both parents are heterozygous, and one allele for each trait exhibits complete dominance . This means that both parents have recessive alleles, but exhibit the dominant phenotype. The phenotype ratio predicted for dihybrid cross is 9:3:3:1 Let's assume that we Are doing a cross with corn. In corn, purple kernels are dominant over yellow and smooth kernels are dominant over shrunken. We sampled and ear of corn and got the following data. Trait Purple Smooth Purple Shrunken Yellow Smooth Yellow Shrunken Does the data above support the dihybrid cross model? # counted 216 79 65 21Explanation / Answer
ratio are in 9:3:3:1
9/16 = 0.5625 , 43/16 = 0.1875 . 1/16 = 0.0625
TS = 1.726
df = r-1 = 4-1 = 3
critical value = 7.81
since TS < critical value , we fail to reject the null and conclude that
data above support the dihybrid cross model
Oi Ei (Oi-Ei)^2/Ei 0.5625 216 214.3125 0.013287402 0.1875 79 71.4375 0.800579615 0.1875 65 71.4375 0.580107174 0.0625 21 23.8125 0.332185039 1 381 381 1.72615923Related Questions
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