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). Which genes are linked?

Question 3 options:

None of the genes are linked.

p and v are linked.

p and b are linked.

b and v are linked.

p, b, and v are linked.

Can you please explain how you know they are linked as well?

None of the genes are linked.

p and v are linked.

p and b are linked.

b and v are linked.

p, b, and v are linked.

Can you please explain how you know they are linked as well?

Explanation / Answer

The three genes are linked because the genes are in the order of v, p and b and are seperated by 22 map units and 15 map units respectively. (The data given in the question is insufficient to give more appropriate explanation).

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