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A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; however, after several years, the farmer sees more and more pigweed growing once again in the fields. Which of the following statements best explains the return of pigweed to the farmer's fields?
a. Triazine-resistant weeds were more likely to survive and reproduce than were non-resistant individuals.
b. Triazine-resistant pigweed has less-efficient photosynthetic pathways than the original form.
c. The herbicide company started selling poor quality triazine.
d. Natural selection caused the pigweed to mutate, creating a new triazine-resistant species.

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marianaegarciaperedo

The best explanation for the return of pigweed to the fields is that Triazine-resistant weeds were more likely to survive and reproduce than were non-resistant individuals (Option a).

Natural selection

Natural selection is an evolutive force that selects beneficial alleles and increases their frequency in the population.

It is the result of the phenotype-environment interaction which determines gene destiny in space and time.

Natural selection results in adaptation, meaning that it causes an increase in the aptitude phenotype.

In many cases adaptations, resulting from natural selection can be correlated to environmental factors or selective pressures applied by other organisms or habitats.

The selective agent is the environmental trait that determines the differential survival of the phenotypic classes.

Mutation

A mutation is a stable and hereditably change in the genetic material.

These changes are unpredictable and occur due to the action of mutagenic agents.

These changes alter DNI sequences and introduce new variants.

Many of these variants are eliminated, but some of them might succeed and be incorporated in each individual, affecting the entire species.

Mutations can be damaging or beneficial. These last mutations are the ones that have been selected by natural selection.

Resistance

Resistance is how a species responds to the constant exposure to pressure.

When a mutation occurs in a species due to the action of environmental pressure, and it is favored by natural selection, we say that the species is developing resistance to the environmental pressure.

The term resistance refers to an inheritable change in the population sensitivity, reflected through the consecutive exposure to pressure.

Insecticides might produce a genetic alteration in insects, leading them to survive under the effects of the chemical.

Insects evolve with the capability of tolerating the poison dose that is usually used to destroy a normal population of plagues.

So, in the exposed example, we are focussing on pigweed populations.

  • The selective pressure or modeling environmental factor is the triazine herbicide.

  • The pigweed's response to herbicides is the survival of only those that carry mutations.

  • Natural selection benefits these mutations.

  • Pigweeds survive and become more resistant

The best explanation for the return of pigweed to the farmer's fields is that Triazine-resistant weeds were more likely to survive and reproduce than were non-resistant individuals (Option a).

You will learn more about resistance at

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