Campbell Biology: Concepts & Connections (8th Edition)
8th Edition
ISBN: 9780321885326
Author: Jane B. Reece, Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan
Publisher: PEARSON
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Chapter 13, Problem 2CC
Complete this concept map describing potential causes of evolutionary change within populations.
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Phenotypic plasticity is the ability of an individual organism to express two or more genetically controlled phenotypes in response to environmental variation. Give an example and give some reasons why organisms depend on phenotypic plasticity instead of maintaining all their systems in a maximum sate of readiness at all times.
Chapter 13 Solutions
Campbell Biology: Concepts & Connections (8th Edition)
Ch. 13 - Summarize the key points of Darwins theory of...Ch. 13 - Complete this concept map describing potential...Ch. 13 - Which of the following did not influence Darwin as...Ch. 13 - Natural selection is sometimes described as...Ch. 13 - In an area of erratic rainfall, a biologist found...Ch. 13 - If an allele is recessive and lethal in...Ch. 13 - In a population with two alleles, B and b, the...Ch. 13 - Within a few weeks of treatment with the drug 3TC,...Ch. 13 - Prob. 9TYKCh. 13 - Write a paragraph briefly describing the kinds of...
Ch. 13 - In the early 1800s, French naturalist Jean...Ch. 13 - Sickle-cell disease is caused by a recessive...Ch. 13 - It seems logical that natural selection would work...Ch. 13 - SCIENTIFIC THINKING Cetaceans are fully aquatic...Ch. 13 - A population of snails is preyed on by birds that...Ch. 13 - Advocates of scientific creationism and...
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- Explain how stabilizing selection, directional selection, and disruptive selection affect the evolution of a population.arrow_forwardGive an example of each of the following evolutionary forces: mutation, natural selection, genetic drift, gene flow, and nonrandom mating.arrow_forwardWhen discussing natural selection and behaviour, we often say that members of a species have certain behavioural traits because those traits are adaptive, in the sense that they increase inclusive fitness relative to alternative forms of those traits that have existed in the past. Instead of emphasizing the adaptiveness of behavioural traits, some biologists describe natural selection as a process that operates on nervous system traits, increasing the prevalence within a population of particular patterns of neural circuitry and neurobiological mechanisms. As an alternative to emphasizing either the behaviour or the nervous system, some biologists describe natural selection as a process that operates on genes; according to this perspective, certain forms of certain genes (ie., particular alleles) increase in prevalence within a population relative to alternative forms of those genes. Which, if any, of these three perspectives on natural selection and behaviour do you think is the most…arrow_forward
- Which of the following are assumptions of the Hardy Weinberg equilibrium model? Mark all the correct assumptions. Group of answer choices there is no mutation all genotypes have different fitness large population sizes sexual selectionarrow_forwardWhich of these scenarios is an example of disruptive selection? Darker colored morphs in a butterfly population are more adaptive than lighter colored morphs, and lighter colored morphs are eliminated from the population. Intermediate gray morphs of a butterfly population are maintained, and the extreme dark and light color morphs have been eliminated. The dark and light color morphs of a butterfly population are maintained, and the intermediate gray morph has been eliminated from the population. A new, unique color form arises from a mutation in a population of butterflies.arrow_forwardMuch attention is given to the existence of genetic variation in populations.Why do evolutionary biologists give so much attention to this? Explain mechanisms thatgenerate genetic variation in populations. Explain mechanisms that maintain geneticvariation in populations. Provide examples and dataarrow_forward
- Consider this example. On a tropical island, there are iguanas that are green, blue, and yellow. The green iguanas can camouflage in the green grass, the yellow iguanas can camouflage in the dry, yellow grass. And the blue iguanas try to run fast to get away from prey. Over time, the blue iguanas disappear on the island, while the green and yellow iguanas survive. What type of natural selection is this? A. Balancing or Stabilizing selection B. Disruptive or Diversifying selection C. Directional selection D. Sexual selectionarrow_forwardDescribe the major components of the runaway sexual selection hypothesis.arrow_forwardIn the model shown below, discuss what kind of geographic barriers would have led to the finch speciation in the Galapagarrow_forward
- Describe the impact of founder effects and population bottlenecks on the genetic diversity of human populations. Provide examples of populations that have experienced these events and discuss their implications for the genetic makeup of contemporary human groups.arrow_forwardWith suitable examples, explain how mechanisms that do notinvolve adaptive traits can change allele frequencyarrow_forwardConsider the following hypothetical scenario involving giraffes. A population of giraffes is composed of individuals of varying neck lengths, i.e., some giraffes have long necks, others have short necks, and some are in-between. Neck length in giraffes is a heritable trait, i.e., offspring have necks similar to their parents due to them inheriting genes from their parents. Within this population, there is competition for resources (leaves to eat). Long-necked giraffes are able to consume more leaves than short or medium-necked giraffes because they can reach leaves that are higher up in the canopy. Therefore, long-necked giraffes, in the current generation, have begun to survive and reproduce more often than giraffes with short or medium necks. https://www.globalchange.umich.edu/globalchange1/current/lectures/selection/selection.html (you can also search “natural selection Michigan” to find this helpful website) If you read between the lines…the above paragraph tells…arrow_forward
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