A farmer uses an herbicide called triazine to control pigweed in his field. Initially, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these is the best explanation for what happened? Group of answer choices: Natural selection favored triazine-resistant pigweed, which was more likely to survive and reproduce. Some pigweed plants adapted to become resistant to triazine and passed the trait to their progeny. Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. The herbicide company lost its triazine formula and started selling lower-quality triazine. Triazine-sensitive pigweed is less efficient at photosynthesis.

A farmer uses an herbicide called triazine to control pigweed in his field. Initially, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these is the best explanation for what happened? Group of answer choices: Natural selection favored triazine-resistant pigweed, which was more likely to survive and reproduce. Some pigweed plants adapted to become resistant to triazine and passed the trait to their progeny. Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. The herbicide company lost its triazine formula and started selling lower-quality triazine. Triazine-sensitive pigweed is less efficient at photosynthesis.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter11: Evolution And Its Processes

Section: Chapter Questions

Problem 15CTQ: If a person scatters a handful of plant seeds from one species in an area, how would natural...

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In several pairs of plant and animal species, plants have become modified such that only its animal partner can pollinate it, and the animals have become modified such that they are especially well adapted to pollinate just their plant partner. What is the name of this type of evolution that results in two organisms becoming particularly adapted to and dependent on each other?
In experiment of genetic drift, suppose you have a population of 300 butterflies. if the population experiences a net growth of 12% in the following year, how many butterflies do you have? Now supposed you have 300 eggs, but only 70% of those eggs become caterpillars, and only 80% of the caterpillars become adult butterflies. How many butterflies do you have? (For simplicity, assume that all butterflies survive to the next year in this example.)
In order for a trait to evolve via natural selection, which of the following must be true regarding the trait? (this is a multiple answer question - so select all correct) Group of answer choices There must be variation in the trait. The trait must make the organism survive longer than organisms with different traits. The trait must confer a reproductive advantage on the bearer of the trait. The trait must be heritable. The trait does not necessarily need to be passed down to offspring.
A meadow is home to a population of plants of a particular species. Among these individuals are 125 plants that have red flowers and 375 plants that have white flowers. The allele of the flower color gene that produces red flowers (R) is completely dominant over the white flower color allele (r). Which statement about this population of plants is true? a- 75% of the flower color alleles are the R allele. b- 13% of the flower color alleles are the R allele. c- 25% of the flower color alleles are the R allele. d- 87% of the flower color alleles are the R allele.
Using Darwin's theory of Natural Selection write a paragraph which explains why resistance to herbicides has evolved in the pigweed plant. Your answer must include the following terms. Please put your terms in bold text for ease of reading. Individual variation Differential survival
In the US, many farmers regularly use the herbicide glyphosate to keep their fields free from weeds. Now, however, they are reporting the presence and spread of superweeds which are resistant to the said herbicide. Give a brief explanation of this using what you learned about natural selection (Modified from Hoefnagels,2016)
In which of the following scenarios would evolution by natural selection take place? A banana tree branch is planted, producing a clone of the parent tree Microorganisms reproduce asexually, producing identical offspring Corn is genetically modified and cloned to make identical crops Penguins reproduce sexually, producing offspring that look different from one another
A population of plants raised in a sealed greenhouse has been pure breeding for red flowers for many generations. There are no other plants of this species in the greenhouse or it does not occur outside of the greenhouse. One day a blue-flowered plant is discovered in the population. Which evolutionary force is responsible for this change? Group of answer choices a. natural selection b. drift c. migration d. mutation
A meadow is home to a population of plants of a particular species. Among these individuals are 125 plants that have red flowers and 375 plants that have white flowers. The allele of the flower color gene that produces red flowers (R) is completely dominant over the white flower color allele (r). Which statement about this population of plants is true? Group of answer choices a. 75% of the flower color alleles are the R allele. b. 13% of the flower color alleles are the R allele. c. 25% of the flower color alleles are the R allele. d. 87% of the flower color alleles are the R allele.
In your own words, how does Genetic Variation support natural selection? Use at least 1 example from the Beaks of Finches lab in your answer.
Fruit scientists are trying to determine the role of the pectinase (p) gene in a plant’s ability to tolerate cold conditions. The table shows each of three possible fruit tree genotypes and the percentage of fruit produced at different temperature ranges. Which of the following statements best describes the evolutionary concept illustrated by this example? A. Homozygous genotypes increase fitness in a population. B. Hybrid plants are known to have a disadvantage over homozygous genotypes. C. Natural selection selects against the recessive gene and for the dominant gene. D. Certain phenotypic variations can significantly increase fitness of the organism in particular environments.
Triazines are a group of chemicals used to kill weeds in the field, such as pigweed and kochia. However, in late 1970s and early 1980s, resistant plants were found that are resistant to triazine applications. Which of the following statements is correct? -The appearance of triazine resistance is the result of mutation. -The spread of triazine resistance in the field is the result of natural selection. -Even if farmers have not used triazines, there would still be individuals with triazine resistance in the field, albeit at a much lower frequency. -All the statements are correct.