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An F2 flowerbed has a total of 929 plants. You observed/counted 705 red flowers and 224...

  1. An F2 flowerbed has a total of 929 plants. You observed/counted 705 red flowers and 224 purple (in these flowers, red flower color is dominant to purple). Based on your knowledge of Mendelian genetics, what would be the genotype for both of the F1 parents that were crossed to produce these F2 plants (write a tentative hypothesis)? Test your hypothesis using chi square analysis and probability values. Remember, because only two traits are examined in this problem, the degrees of freedom (df) value is SHOW ALL WORK!
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Answer #1

Red = RR, Rr

Purple = rr

Genotype of F1 parents = Rr and Rr

Null hypothesis : Both the parents were heterozgyotes.

Rr × Rr

Expected ratio = 3 (red) : 1 (purple)

Expected numbers = 696.75 (red), 232.25 (purple)

Phenotype #observed #expected (O-E)^2/E
Red 705 696.75 0.0977
Purple 224 232.25 0.293

Calcuated chi sqaure = 0.0977 + 0.293 = 0.3907

Degrees of freedom = 2 - 1 = 1

p value = 0.1 to 0.9

p value is more than 0.05. So, we will accept null hypothesis.

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