2. There are 3 types of polar bears: bears with thick coats, bears with thin coats, and bears with medium coats. It is the fall season and will soon be winter. The temperatures are dropping quickly and the bears must be kept warm or they will freeze to death. Many of the bears have had 2 cubs each, but due to the extreme temperatures many mothers only have one cub left. a. Which bear will natural selection select AGAINST? b. Identify Darwin's 4 points in the scenario above. i. How does the population have variation? ii. Which variation is an adaptation (beneficial)? jii. How is the population overproducing? iv. Which population will descend with modification? FOR?

2. There are 3 types of polar bears: bears with thick coats, bears with thin coats, and bears with medium coats. It is the fall season and will soon be winter. The temperatures are dropping quickly and the bears must be kept warm or they will freeze to death. Many of the bears have had 2 cubs each, but due to the extreme temperatures many mothers only have one cub left. a. Which bear will natural selection select AGAINST? b. Identify Darwin's 4 points in the scenario above. i. How does the population have variation? ii. Which variation is an adaptation (beneficial)? jii. How is the population overproducing? iv. Which population will descend with modification? FOR?

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 3RQ: Which of the following situations will lead to natural selection? a. The seeds of two plants land...

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Which of the following is not true of natural selection? (a) natural selection acts to preserve favorable traits and eliminate unfavorable traits (b) the offspring of individuals that are better adapted to the environment will make up a larger proportion of the next generation (c) natural selection directs the course of evolution by preserving the traits acquired during an individuals lifetime (d) natural selection acts on a populations genetic variability, which arises through mutation (e) natural selection may result in changes in allele frequencies in a population
Natural Selection Affects the Frequency of Genetic Disorders Will a recessive allele that is lethal in the homozygous condition ever be completely removed from a large population by natural selection?
Which of the following is not a component of Darwins theory as he understood it? a. Some individuals in a population survive longer than others. b. Some individuals in a population reproduce more thanothers. c. Heritable variations allow some individuals to compete moresuccessfully for resources. d. Mutations in genes produce new variations in a population. e. Some new variations are passed to the next generation.
Which of the following ideas is not included in Darwins theory? a. All organisms that have ever existed arose through evolutionary modifications of ancestral species. b. The great variety of species alive today resulted from the diversification of ancestral species. c. Natural selection drives some evolutionary change. d. Natural selection preserves advantageous traits. e. Natural selection eliminates adaptive traits.
The wings of birds, the legs of pigs, and the flippers of dolphins provide examples of: a. vestigial structures. b. homologous structures. c. acquired characteristics. d. artificial selection. e. uniformitarianism.
Charles Darwin proposed that evolution could be explained by the differential reproductive success of organisms that resulted from their naturally occurring variation. Darwin called this process (a) coevolution (b) convergent evolution (c) natural selection (d) artificial selection (e) homoplasy
Medical advances now allow many people who suffer from genetic diseases to survive and reproduce. These advances: a. refute Darwins theory. b. support Lamarcks theory. c. disprove descent with modification. d. reduce the effects of natural selection. e. eliminate adaptive traits
Which scientific concept did Charles Darwin and Alfred Wallace independently discover? a. mutation b. natural selection c. overbreeding d. sexual reproduction
_________is the original source of new alleles. a. Mutation c. Gene flow b. Natural selection d. Genetic drift
INTERPRET DATA In a population at genetic equilibrium, the frequency of the dominant phenotype is 0.96. What are the frequencies of the dominant (A) and recessive (a) alleles, and what are the expected frequencies of the AA, Aa, and aa genotypes?
Match the modes of natural selection with their best description. ____ stabilizing a. eliminates extreme forms of a trait ____ directional b. eliminates midrange forms of a trait ____ disruptive c. shifts phenotypes in one direction
EVOLUTION LINK Darwins theory of evolution by natural selection is based on four observations about the natural world. One of them is that each individual has a combination of traits that makes it uniquely different. Darwin recognized that much of this variation among individuals must be inherited, but he did not know about Mendels mechanism of inheritance. Based on what you have learned in this chapter, briefly explain the variation among individuals that Darwin observed.