For a particular genetic strain of corn, you suspect that abnormal meiosis I in

Question

For a particular genetic strain of corn, you suspect that abnormal meiosis I in corn can result in color variation in corn kernels that does not fit Mendel's Principle of Segregation. In previously published work, it was shown that in other strains of corn, there is an equal time span for each phase of Meiosis I. You've collected the observed data below: Complete the c^2 table. (For the exam, you would be provided with a copy of the c^2 probability table.) Write the null hypothesis (H_0). Briefly interpret of the results of the c^2 test.

Explanation / Answer

Expected number

e

d

(o-e)

Expected value can be calculated by dividing the total number 100 by the number of phases 4

So the expected value will be 25.

a) The Chi-Square value is 3.28

Degrees of freedom is n-1 ie 4-1=3

P- value from the chi- square distribution table is 0.223

b) Null hypothesis H0

The chi-square distribution value is between the range of 0.50 and 0.25. When compared to the significant value, P value is greater than the significant value. Hence H0 is not rejected in this case as the obtained range is not less than 0.05 and it is considered not significant.

c) The chi-square distribution clearly states that the observed data does not fit the Mendel's principle of segregation as the results observed are insignificant

Mitotic phase Observed number

Expected number

e

d

(o-e)

d2 d2/e Prophase I 30 25 5 25 1 Metaphase I 20 25 -5 25 1 Anaphase I 21 25 -4 16 0.64 Telophase I 29 25 4 16 0.64 Total 100 3.28

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