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Fitness and Gene Flow
Answer the questions below.
EI The probability of survival and reproduction in a particular environment
E 2 A change in allele frequency in a population due to random sampling
(often affecting small populations)
3. A fact that some organisms survive and reproduce better in certain environments
than others.
44. The process that creates new alleles in a population
5. The movement of alleles within a population
C6 The movement of individuals in and out of a population
(C) Bethany Lau 2016
7 Selection that amplifies male and female differences
8 Term scientists use to describe what happens when a small population breaks off of a
large population and moves into a new environment. The small population may not have
the same allele frequencies as the large population.
a Term scientists use to describe what happens when some sort of catastrophe or major
event that reduces a large population dramatically to produce a much smaller
population
Scientists studied populations of Columbia spotted frogs in 28 breeding ponds in areas of Montana and Idaho.
They were interested in learning whether ponds at different elevations (low elevation areas like valleys and high
elevation areas like mountains) would have different rates of gene flow and genetic variation.
10. Brainstorm 2 different environmental differences that could differ between low
elevation ponds and high elevation ponds.
II How might these two differences affect frog breeding and
survival (fitness) at different elevations?
A mutation
B. gene flow
C. migration
D. Fitness
Egenetic-drift
F. natural selection
-e-bottleneck effect
-H-founder effect
I sexual selection
Here are their findings:
12. Ponds at higher elevations had individuals who were
less different from each other. Genetic variation
decreased with increasing elevation Why do you think
this is true?
13. Ponds at lower elevations, even ponds that are far
away from each other by distance, have high levels of
gene flow. There was evidence to suggest individuals at
different far away ponds mated with each other. What
does this tell you about the lower elevation frog's ability
to move?