Answer:
Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error).
Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.
Genetic drift may result in the loss of some alleles (including beneficial ones) and the fixation.
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).
Since the means of reproduction have changed, the population of peacocks would probably start losing their pretty feather colors due to the fact that over time females would be mating with the containing the other trait (and possibly not the pretty feathers). This would then produce offspring with ugly colors but also with the desired trait. This would continue on and on until those with the desired trait outnumbered or possibly extinguished the now unnecessary vibrant feather colors.
<span>REM sleep is a period of sleep where your eyes move rapidly (Rapid Eye Movement). After a period of REM sleep, your body experiences 5 to 15 minute periods of non-REM sleep. During this lighter sleep it is much easier for you to be awakened. There are different periods of REM sleep which can last from 10 minutes to one hour. The longer you sleep, the longer the REM period will last. This cycle will occur on average every 90 minutes.</span>