What is the time difference between Perth Australia and New York? Perth is 12 hours ahead of New York from the 2nd Sun. of March until the 1st Sun. of Nov. From the 1st Sun. of Nov. until the 2nd Sun. of March, Perth is 13 hrs. ahead of Ne â¦ w York.
Microevolution is the change in allele frequencies that occur over time within a population.igration into or out of a population can change allele frequencies, as well as introducing genetic variation into a population. Immigration may add new genetic material to the established gene pool of a population. Conversely, emigration may remove genetic material.
But small population sizes also introduce a random element called genetic drift into the population genetics of organisms. Genetic drift is a process in which allele frequencies within a population change by chance alone as a result of sampling error from generation to generation.nder a scenario of pure genetic drift, the probability of fixation of an allele in a population is its initial frequency in the population. If the initial frequency of an allele is 0.01, then there is a 1% chance that this allele will be fixed in this population.