The bottle neck effect occurs when A few individuals start a new population in an area that is separate from their original population The environment selects a small number of individuals in a population A few individuals in a population are randomly selected for by an event Allele frequencies of a population remain constant over time Allele frequencies shift leading to an adaptation Small populations are more susceptible to the effects of genetic drift. True False Genetic drift selects for specific alleles in a population. True False Which of the following is an example of the founder effect? A forest fire kills a large number of squirrels and the remaining few squirrels survive and reproduce. A hurricane blows a few lizards to an island in the Caribbean that previously did not have these types of lizards on them. Petunia rode her bicycle over a population of insects on the sidewalk and killed some of them. The population of Cheetahs in South Africa
Added by Brandy B.
Close
Step 1
True Show more…
Show all steps
Your feedback will help us improve your experience
Jorge Villanueva and 51 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Genetic variation can be introduced into a population by: a) mutation in an individual's genetic code. b) the bottleneck effect. c) the selection of the fittest individuals in the population. d) a new allele arising from a single mutation in a gene. Question 25 (3 points) Genetic drift occurs when a population of organisms which normally don't travel great distances, like fruit flies, floats on a tree branch or piece of fruit across an ocean barrier to colonize a new location. True False Question 26 (3 points) Evolution: a) can only happen in populations with genetic diversity. b) happens within individuals during their lifetimes. c) always results in organisms that are perfectly adapted to their environments. d) is a combination of random, and non-random processes. Question 27 (3 points) New, closely related species which reconnect over part of their range may interbreed and produce infertile offspring. True False
Sukhada S.
A skin and respiratory fungus killed most of the tree frogs in a hypothetical forest in the state of Washington. The population dropped from 1,200 to 320. Scientists caught 25 frogs and, in an effort to help preserve the species, started a new population in a similar forest in the eastern portion of the state of Oregon. Which of the following factors would probably have the least impact on this new population? A. The founder effect, since there would be a large population with immigration. B. Random mating, since this affects populations regardless of size. C. Genetic drift, since the small population will have variability in allele frequency. D. The bottleneck effect, since the small population will go through a decrease in allelic variability.
Supreeta N.
In considering the formation of the A-P and D-V axes in Drosophila, we noted that, for mutations such as bcd, homozygous mutant mothers uniformly produce mutant offspring with segmentation defects. This outcome is always true regardless of whether the offspring themselves are $b c d^{+} / b c d$ or $b c d / b c d .$ Some other maternaleffect lethal mutations are different, in that the mutant phenotype can be "rescued" by introducing a wild-type allele of the gene from the father. In other words, for such rescuable maternal-effect lethals, $m u t^{+} / m u t$ animals are normal, whereas $m u t / m u t$ animals have the mutant defect. Explain the difference between rescuable and nonrescuable maternal-effect lethal mutations.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD