Exam (elaborations)
Ecology And Evolution Exam 2 Correct Answers!!
- Course
- BIO 1
- Institution
- Stanford University
Ecology And Evolution Exam 2 Correct Answers!!
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Q&AEcology And Evolution: Exam 2
Correct Answers!!
0.5 - Answers what is the allele frequency of the white allele in this
population?
12 SS, 24Ss, 12ss
genetic drift - Answers random change in allele frequencies,
common in small populations
random sampling error
- sampling error is high with a smaller sample - Answers genetic drift
results from
A. Natural Selection
B. Migration
C. Bottlenecking
D. Random Sampling Error
, Q&A
True - Answers T or F:
Bad alleles do not get weeded out through population bottleneck
increase population size - Answers how could you slow down
genetic drift?
genetic variation - Answers Genetic drift reduces ________
___________ in a population
bottleneck - Answers drastic loss of alleles due to some random
reason
-more likely to occur in a smaller population
B- drift is random, selection is not - Answers How is drift different
from selection?
A. You never lose alleles due to selection
B. Drift is random, selection is not
C. Selection is random, drift is not
the larger one is the one that does not reach zero first. If it is a smaller
population, the chart will reach zero sooner (check notes for pictures)
- alternative allele is fixed (reaches frequency of 100%) or lost (0%) -
Answers How can you tell which population is larger on a graph
, Q&A
bottleneck effect and founder effect - Answers Drift can play a role in
the evolution of small pops in 2 ways:
Both are ex. of genetic drift
founder effect - Answers a new population is started by a small
number of individuals
C- Founders effect leads to a new population, bottleneck doesn't -
Answers What is one main difference between a bottleneck and
founder's effect?
A. A bottleneck is the result of selection
B. Founders effect is the result of selection
C. Founders effect leads to a new pop, bottleneck doesn't
D. Bottleneck leads to a new pop, founders effect doesn't.
True - Answers T or F:
Drift can produce substantial changes in allele frequency even in large
populations if time passes
False
- genetic drift is often associated with inbreeding further reducing genetic
variation in populations - Answers T or F:
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