A farmer wishes to develop a strain of high-yield corn that is also resistant to drought. He has the following individuals from the current year's crop:

Individual A—Yield: 179 bushels/acre; drought resistance: high
Individual B—Yield: 220 bushels/acre; drought resistance: low
Individual C—Yield: 185 bushels/acre; drought resistance: medium
Individual D—Yield: 140 bushels/acre; drought resistance: high
Individual E—Yield: 200 bushels/acre; drought resistance: medium

Which of the following crosses would produce the highest corn yield with the highest resistance to drought?

A×E

Explanation:

To Improve on a particular trait selection is made using the best parent that could give the best results. A trait that will be improved on should not affect your field, hence as a plant breeder the Goal is a traits that has been improved and will give the maximum yield. What a farmer needs is an improved variety with a better yield hence the seeds will not be approved for commercial commodity if low yielding.

Individual A—Yield: 179 bushels/acre; drought resistance: high

Individual E—Yield: 200 bushels/acre; drought resistance: medium

Individual A is high in resistance but has a moderate yield while individual E has a medium resistance but high yielding, a cross between A×E will give a more resistance variety and a better yielding variety because they are both the best parents for the genes needed and the two gene will be introduced into the new individual.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.