a From a testcross Aa aa in which A represents red and a re

a) From a testcross A/a × a/a, in which A represents red and a represents white, use the ² test to find out which of the following results statistically fits with a predicted Mendelian pattern of gene segregation. The test evaluates where deviations from Mendelian ratios is most likely due to chance. Use a 95% confidence level as the cutoff: p values of less than 0.05 are considered to not display \"fit,\" and reveal a significant deviation from the hypothesis

(Problem 24a) From a testcross A/a × a/a, in which A represents red and a represents white, use the ² test to find out which of the following results statistically fits with a predicted Mendelian pattern of gene segregation. The test evaluates where deviations from Mendelian ratios is most likely due to chance. Use a 95% confidence level as the cutoff: p values of less than 0.05 are considered to not display \"fit,\" and reveal a significant deviation from the hypothesis.

Testcross result: 120 red, 100 white

b)

You have three jars containing marbles, as follows:

jar 1: 600 red and 400 white
jar 2: 900 blue and 100 white
jar 3: 10 green and 990 white

If you blindly select one marble from each jar, calculate the probability of obtaining a red, a blue, and a green.

c)

We have dealt mainly with only two genes, but the same principles hold for more than two genes. Consider the following cross:

A/a ; B/b ; C/c ; D/d ; E/e × a/a ; B/b ; c/c ; D/d ; e/e

Assuming independent assortment, what proportion of progeny will phenotypically resemble the first parent?

d)

Consider the following cross:

A/a ; B/b ; C/c ; D/d ; E/e × a/a ; B/b ; c/c ;D/d ; e/e

Assuming independent assortment, what proportion of progeny will phenotypically resemble either parent?

e)

Consider the following cross:

A/a ; B/b ; C/c ; D/d ; E/e × a/a ; B/b ; c/c ; D/d ; e/e

Assuming independent assortment, what proportion of progeny will be genotypically the same as the first parent?

Solution

Answer: 0.0054

(probability of red on jar1) x (probability of a blue on jar2) x (probability of a blue on jar3)= 6/10 x 9/10 x 1/10 =    0.0054