A three-point testcross was made in corn. The results and a recombination analys

Question

A three-point testcross was made in corn. The results and a recombination analysis are shown in the display below, which is typical of three-point testcrosses (p = purple leaves, + = green; v = virus-resistant seedlings, + = sensitive; b = brown midriff to seed, + = plain). Calculate interference, if appropriate.

Question 4 options:

zero

0.4

0.41

0.6

0.72

Please write your work out on how to solve the problem, I really need to learn how to do this

zero

0.4

0.41

0.6

0.72

Please write your work out on how to solve the problem, I really need to learn how to do this

Explanation / Answer

a. The three genes are linked.

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b. Comparing the parentals (most frequent) with the double crossovers (least frequent), the gene order is v p b. There were 2200 recombinants between v and p, and 1500 between p and b.

The general formula for map units is: m.u. = 100% (number of recombinants)/total number of progeny

Therefore, the map units between v and p = 100% (2200)/10,000 = 22 m.u.,

and the map units between p and b = 100%(1500)/10,000 = 15 m.u.

The map is v----------------- p--------------------------------- b

v---------22 m.u-----------p----------- 15 m.u.---------------b

============================================================

c. I = 1

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