Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 47.1, Problem 1TYK
In 1977, Rafael Guzman, a Mexican biologist, discovered a previously unknown wild relative of corn that is resistant to many of the viral diseases that infect domestic corn. Agriculturalists believe crossbreeding could improve current corn crops. In this case, biodiversity is important at which level?
- ecosystem
- community
- species
- both a and b
- genetic
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Which of these is an example of a key innovation?
A caterpillar of a butterfly species provides honey to an ant colony in order to receive protection and care.
A founding population of honeycreepers evolves beaks capable of cracking the seed of a tree species in their new habitat.
A new flower color morph arises in a plant population, but an associated pollinator does not distinguish flowers by color.
Co-occurring diploid species of wheat and goatgrass hybridize to form a viable tetraploid offspring that can no longer breed with its parents.
Say there is a population of plants that live in a wetland, and are adapted to tolerate both flooding and drought. One year, the wetland floods completely, and only the most water-tolerant plants are able to survive. The wetland never drains, and over many years the plants adapt to stay submerged all year. Many generations later, the wetland returns to being wet and dry, and the entire population dies out.
Is this an example of a historical constraint or genetic correlation?
The red wolf (Canis rufus) was once widespread in the southeastern United States but was declared to be extinct in the wild. Biologists bred captive red wolf individuals and reintroduced them into areas of eastern North Carolina, where they are federally protected as endangered species. The current wild population is estimated to be about 100 individuals. However, a new threat to red wolves has arisen: hybridization with coyotes (Canis latrans), which have become more numerous in the areas inhabited by red wolves. Although red wolves and coyotes differ in morphology and DNA, they are capable of interbreeding and producing fertile offspring. Social behavior is the main reproductive barrier between the species and is more easily overcome when same-species mates are rare. For this reason, some people think that the endangered status of the red wolf should be withdrawn and resources should not be spent to protect what is not a “pure” species. Do you agree? Why or why not?
Chapter 47 Solutions
Principles of Biology
Ch. 47.1 - In 1977, Rafael Guzman, a Mexican biologist,...Ch. 47.2 - Prob. 1TYKCh. 47.2 - Prob. 2TYKCh. 47.3 - Prob. 1CCCh. 47.3 - Prob. 2CCCh. 47.3 - Prob. 1BCCh. 47.3 - Prob. 1TYKCh. 47.3 - Prob. 2TYKCh. 47.3 - Prob. 3TYKCh. 47 - Prob. 1TY
Ch. 47 - Prob. 2TYCh. 47 - The idea that humans have an intimate love of...Ch. 47 - Prob. 4TYCh. 47 - Prob. 5TYCh. 47 - Prob. 6TYCh. 47 - Prob. 7TYCh. 47 - Prob. 8TYCh. 47 - Prob. 9TYCh. 47 - The American buffalo, Bison bison, is considered a...Ch. 47 - Prob. 1CCQCh. 47 - Prob. 2CCQCh. 47 - Prob. 3CCQCh. 47 - Prob. 1CBQCh. 47 - Prob. 2CBQ
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Evolution Biologists define evolution as the change in the frequency of alleles (variations of a gene) in a population. Consider the following situation: Two colors of grasshoppers-brown and red-result from the two variations (alleles) of the color gene in this species. These grasshoppers live in two areas: an area with brown soil, and on an adjacent mountain with reddish soil. All the grasshoppers in both areas were accidentally killed by a fire. Ecologists re-introduced 1000 red and 1000 brown grasshoppers into each of the two soil areas. And, grasshoppers are a great food source for any bird that can catch them. 1. What do you think the ecologists discovered when they returned to the experimental sites five years later? 2. What factor controls the actual color of a grasshopper? 3. What determines the color frequency of grasshoppers in the two soil areas? 4. Is there only one direction of change during evolution? Explain your answer.arrow_forwardTwo species of plants grow along a mountain slope. One species grows mainly at low altitudes, and the other grows mainly at higher altitudes. Occasionally, the two species hybridize producing hybrids that are better suited than the parental species to grow at intermediate altitudes. This scenario would lead to Question 7 options: reinforcement autopolyploidy a stable hybrid zone hybrid breakdown the fusion of the two speciesarrow_forwardplease helparrow_forward
- Please Help mearrow_forwardA 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). What is the total number of flower color alleles in this population of plants? a- 500 b- 2 c- 375 d- 1,000 e- 4arrow_forwardA farmer plants transgenic Bt corn that is genetically modified to produce its own insecticide. Of the corn borer larvae feeding on these Bt crop plants, only 10 percent survive unless they have at least one copy of the dominant resistance allele B that confers resistance to the Bt insecticide. When the farmer first plants Bt corn, the frequency of the B resistance allele in the corn borer population is 0.02. What will be the frequency of the resistance allele after one generation of corn borers have fed on Bt corn?arrow_forward
- The beetle pollinators of a particular plant are attracted to its flowers' bright orange color. The beetles not only pollinate the flowers, but they mate while inside the flowers. A mutant variant of the plant producing red flowers becomes more common with the passage of time. A particular variant of the beetle prefers the red flowers to the orange flowers. Over time, the two beetle variants diverge from each other to the point that interbreeding is no longer possible between them. What kind of speciation has occurred in this example, and what has driven it? Question 27 options: sympatric speciation; habitat (niche) differentiation sympatric speciation; allopolyploidy allopatric speciation; behavioural isolation allopatric speciation; ecological isolation sympatric speciation; sexual selectionarrow_forwardBoth mutation rate and population size influence genetic diversity, but they do so to different degrees. Which of the following is WRONG as a comparison of genetic diversity between two populations? O a. Cheetah population (100 individuals ) > Nycterophilia bat flies that live on them d. Forest owlet (between 70 and 400 individuals) >> Ridgway's hawk (maximum 50 individuals) e. cardinalflower (Northeast and South of North America) >> smooth azalea (only in the Eastern seaboard)arrow_forwardA A Ao Question 45 The atmosphere is an important source of both carbon and oxygen in aquatic systems. Question 45 options: A) True B) False Question 46 Energy sources from within an aquatic system are known as allochthonous. Question 46 options: A) True B) False Question 47 Cooperative breeding is more likely to occur Question 47 options: A) when inbreeding has no effect. B) when successful dispersal is difficult. C) when most individuals are unrelated. D) when long-distance dispersal is possible.arrow_forward
- Which of the following might occur in the same geographic area but actually be an example of micro-allopatry? A. A population of moths that becomes polymorphic for mating pheromones B. Jumping spiders in which a new mutation leads some males to do a novel mating dance to attract females C. Chromosomal duplication in a plant that reproductively isolate it D. Flightless aphids where a mutation leads a portion of the population to specialize on a different food plantarrow_forwardAn invasive species specialist often observes an introduced frog species spawning in small ponds right beside a native species of frog, but never observed any evidence of hybridization. What type of reproductive isolation mechanism is this?arrow_forwardHybrid breakdown refers to which situation? Group of answer choices Two species can hybridize but their offspring do not develop fully or are frail and will not survive to reproduce. Two species can hybridize but their offspring are sterile. None of the above Two species can hybridize and their offspring are ok and can have offspring, but the next generation are more likely to die or will be sterile. Two species can hybridize and fuse back into one species.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Mendelian Genetics and Punnett Squares; Author: Professor Dave Explains;https://www.youtube.com/watch?v=3f_eisNPpnc;License: Standard YouTube License, CC-BY
The Evolution of Populations: Natural Selection, Genetic Drift, and Gene Flow; Author: Professor Dave Explains;https://www.youtube.com/watch?v=SRWXEMlI0_U;License: Standard YouTube License, CC-BY