Genetic drift often occurs when there is a founder event because Because the founding population is usually composed of individuals with greater fitness (like strength) than individuals in the original population. Because the founding population is almost never a perfectly random sample of the original population. Because the founding population usually experiences high mortality during the founding event. Because the founding population usually experiences very different selection than the original population.

Genetic drift often occurs when there is a founder event because Because the founding population is usually composed of individuals with greater fitness (like strength) than individuals in the original population. Because the founding population is almost never a perfectly random sample of the original population. Because the founding population usually experiences high mortality during the founding event. Because the founding population usually experiences very different selection than the original population.

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 6RQ: Galapagos medium ground finches are found on Santa Cruz and San Cristóbal islands, which are...

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Which of the following statements describes an example of genetic drift?a. Allele g for fat production increases in a small population because birds with more bodyfat have higher survivorship in a harsh winter.b. Random mutation increases the frequency of allele A in one population but not inanother.c. Allele R reaches a frequency of 1.0 because individuals with genotype rr are sterile.d. Allele m is lost when a virus kills all but a few individuals and just by chance, none ofthe survivors possess allele m.
Under genetic drift, if an allele’s frequency is 1%, what is the likelihood that it will be lost from the population? part B; Construct a graph that describes the likelihood of fixation of a particular allele, for a small population that is under Wright-Fisher genetic drift. Don’t forget to label axes completely.
Natural selection operates on populations over many generations. Which of the following allows natural selection to occur? A. the desire and the advantage of a population to remain constant B. the old age of the individuals which causes them to die C. the abilty for populations to change quickly from one trait to the next D. the unequal ability of individuals to survive and reproduce
The founder effect is a type of (genetic drift / gene ﬂow) in which individuals in one small group of a large population (establish a new distant population / are the only survivors) and then reproduce.
A severe fire or flood kills 90% of a population of squirrels in a forest. The remaining squirrels evolve into a population quite distinct from the original. In another forest, a bacterial infection kills 90% of the squirrels in the forest, and the remaining squirrels also evolve into a distinct population. The first instance is considered genetic drift, and the second is natural selection. Explain the difference.
Natural selection makes an adaptive trait more common in a population. After many generations, will all individuals in the population have the same adaptive trait?
Galapagos medium ground finches are found on Santa Cruz and San Cristóbal islands, which are separated by about 100 km of ocean. Occasionally, individuals from either island fly to the other island to stay. This can alter the allele frequencies of the population through which of the following mechanisms? a. natural selection b. genetic drift c. gene flow d. mutation
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
The genetic description of an individual is its genotype, whereas the genetic description of a population is its (a) phenotype (b) gene pool (c) genetic drift (d) founder effect (e) changes in allele frequencies
A change in one or more characteristics of a population that is heritableand occurs from one generation to the next is calleda. natural selection.b. sexual selection.c. population genetics.d. evolution.e. inheritance of acquired characteristics.
Which of the following is correct (can be more than 1): Genetic drift is an important mechanism of evolution: A. when the difference in fitness between alleles is small B. when a small number of individuals found a new population C. when the difference in fitness between alleles is large D. when population size is small E. when population size is large F. during and after a population bottleneck
How can gene flow impact a population's allele frequencies? Choose one of the following: By causing mutations in the DNA By introducing new alleles through migration By wiping out a large proportion of the population