Question

Question 15 Not yet answered Marked out of 1.00 P Flag question D From your dihybrid cross you obtain a chi-square value of 6.95. Using the chi square table below, what is the probability of a larger chi-squared value? Degrees of Freedom 0.05 1 0.01 66 9.21 11 5.99 7.81 3 4 5 Percentage Points of the Chi-Square Distribution Probability of a larger value of 0.99 095 0.75 0.50 0.35 0.10 0000 0.004 0.016 102 2.11 0030 0.103 0.211 0575 1386 277 0115 0.54 2.366 6.25 0297 0111 104 1933 7.73 1610 2675 16 2.304 3455 5. 784 10.64 12 2013 4355 66 9.04 16 2.733 5071 7.34 1023 3335 8. 3540 1159 16 8 14 15 16.0 183 2009 215 2321 10 Select one: a. >0.01 b. 0.01-0.05 OC. 0.05-0.10 d. >0.25

Answer 1

As in a dihybrid cross, there are four possible classes of offspring that can be produced, so there are three degrees of freedom.

The probability value (p) can be defined as the probability that a deviation greater than each chi-square value would occur by chance simply.

As it is given, chi-square value = 6.95

From the table, percentage points of the chi-square distribution can be calculated.

In the row with the 3 degrees of freedom, it is checked in which range, the value of 6.95 lies in the given columns.

i.e. 6.95 lies between 6.25 and 7.81 of the p-values between 0.05-0.10.

Hence, c. 0.05 - 0.10 is the correct answer.