Evolution is a process by which the frequencies of various traits (alleles) within a population change over time. There are numerous factors that affect the rate of evolution, including genetic drift and gene flow. Two scientists discuss the impact of both phenomena on small, insular populations.
Genetic drift is most influential in the evolution of small populations. Because there are so few individuals in the population, random fluctuations in allele frequencies would severely impact one generation to the next. Gene flow would not be as important, because the populations are isolated. Individuals are unlikely to emigrate or immigrate.
Gene flow is the most influential factor on the evolution of small populations. Although genetic drift could have a profound impact, gene flow would result in the omission of an allele (lost due to emigration) or the addition of a new allele (gained due to immigration).
There is much evidence that small groups or individuals will travel long distances in search of food, habitat, or mates. Therefore, it is likely that isolated populations without many resources were continually migrating.
0 of 5 Questions completed
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
0 of 5 Questions answered correctly
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
Both scientists would most likely agree with which of the following statements:CorrectIncorrect
A population of black and blue winged butterflies was studied in a remote area of Mexico. One year, by chance, more butterflies emerged with black wings than with blue wings. The following year, by chance, no blue winged butterflies emerged. This finding would support the theory or which, if any, scientist.CorrectIncorrect
Which of the following situations does Scientist 2 use as support of his theory?CorrectIncorrect
An isolated colony of bacteria is studied, and it is determined that mutations are the driving evolutionary force. This finding would support which, if either, theory?CorrectIncorrect
Which of the following situations best reflects an instance of gene flow as it is defined in the passage?CorrectIncorrect