5) 9900 of the original chipmunk population migrate outside of Yellowstone natio
ID: 163707 • Letter: 5
Question
5) 9900 of the original chipmunk population migrate outside of Yellowstone national park leaving 36 albino chipmunks in the remaining population of 100 chipmunks. If we assume that all chipmunks were equally likely to migrate, how did the migration affect the predicted frequencies of alleles in the remaining population? (note: assume the new population like the original population is in H-W equilibrium)
a) frequency of a allele _________
b) frequency of A allele _________
c) frequency of aa allele _________
d) frequency of Aa allele _________
e) frequency of AA allele _________
f) did the allele frequencies of the remaining Yellowstone park chipmunk population change as a result of migration? _________
g) did microevolution occur?
please your answer?
h) what do you call the evolutionary mechanism that results in changes in gene frequency in a population due to chance events? ________
Explanation / Answer
Total number of chipmunks remained after migration = 100
Number of albino chipmunks = 36
a) frequency of allele a = 36/ 100 = 0.36
b) frequency of allele A = 1 - 0.36 = 0.64
c) frequency of aa genotype = (0.36)2 = 0.13
d) frequency of Aa genotype = 2pq = 2 (0.36) (0.64) = 0.46
e) frequency of AA genotype = (0.64)2 = 0.41
f) The gene flow or movement of alleles occurs due to migration of individuals. The gene flow can introduce new alleles in to the populations or can change the frequency of existing alleles. The overall effect of gene flow is to decrease the difference the populations. Migration of chipmunks has resulted in change of allele frequencies.
g) Microevolution is change within a species or small population over a short period. Migration of chipmunks has resulted in change of allele frequencies and this may result in microevolution in chipmunk population.
h) The changes in gene or allele frequencies are resulted due to natural selection, mutations, genetic drift and gene flow by migration. Such evolutionary mechanism is known as micoevolution.
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