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.
When the allelic frequency in a population reaches 1.0, the allele is the only one left in the population, and it becomes fixed for that allele. The other allele is permanently lost. In populations in which an allele has become either fixed or lost, the process of random genetic drift stops at that locus. Without further input (mutation), the populations that have allelic frequencies of 1.0 or 0 for either allele will maintain those allelic frequencies forever.