Herbicides are used to kill weeds or plants growing where they are not wanted. A crop of corn has been genetically modified so that it is resistant to a type of herbicide that kills several species of weeds that commonly grow in the fields and interfere with growth of the corn
crop.
Which question would help determine whether the corn is expressing the gene that provides herbicide resistance?
A. Has the herbicide caused damage to the corn?
B. Do seeds produced by the corn produce new corn plants?
C. Are the weeds in the field killed by the herbicide?
D. Are insects eating the leaves and damaging the corn plants?

The question that would help determine whether the corn is expressing the gene that provides herbicide resistance is Has the herbicide caused damage to the corn? Option A.

Herbicides

It is a common practice to use herbicides in fields to reduce the number of unwanted plants that are competing with the wanted ones for resources.

Herbicides affect different species in many ways. They might kill plants, they might affect reproduction, photosynthesis, among other ways.

In the exposed example, We know that this particular herbicide kills several plant species in the areas where it is used.

Field observations

If we need to determine whether or not the corn is expressing the resistance gene, the first thing we should evaluate after using the product is the state of the corn plants.

Are they dead?

Are they damaged?

In the field, this is what we will first observe in plants.

If they are not expressing the gene, the corn plants will be dead or will be seriously affected.

If they are expressing the gene, they will not express morphological or physiological damage.

So the correct answer is option A. The question that would help determine whether the corn is expressing the gene that provides herbicide resistance is Has the herbicide caused damage to the corn?

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