Question

5. In the early 18th century, many Amish immigrated to Pennsylvania. Of 1000 immigrants, 40 had the genotype dd. If we assume that all the Amish were equally likely to migrate, how did the migration affect the frequencies of alleles in the migrating population? (Note: assume the new population like the original population is in H-W equilibrium) (Show all your calculations below) (a) Frequency of d allele = (b) Frequency of D allele = (c) Frequency of dd genotype = (d) Frequency of Dd genotype = _ (e) Frequency of DD genotype = (f) Did the allele frequencies of the migrating Amish population change as a result of migration? (g) Did microevolution occur? Explain your answer. (g) What do you call the evolutionary mechanism that results in changes in gene frequencies in a population due to chance events?!

Answer 1

From the above photo we get

Given frequeneg a dd allele = 40/1000 = 0.04 a tuequency of d allere = doon = 0.2 frequency oq D=0.8 ( Ded=1). & a frequency q DD=0.64 3 .16 Enequency a od = 0.24 0.8

a)frequency of d allele=0.2

b)frequency of D allele=0.8

c)frequency of dd genotype=0.04

d)frequency of Dd genotype=0.16

e)frequency of DD genotype=0.64

f)Yes,the frequency of migrating amish population would change as result of migration.

g)yes,microevolution occurs,here the factor is genetic drift, that is Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error). Genetic drift may result in the loss of some alleles (including beneficial ones) and the fixation, or rise to 100%percent frequency, of other alleles. Genetic drift can have major effects when a population is sharply reduced in size by a natural disaster (bottleneck effect) or when a small group splits off from the main population to found a colony (founder effect).

g)genetic drift.