|Genetic drift can be defined as a change in the frequency of allele that is random instead of being driven by selection pressures. According to Mendel law, alleles are randomly assorted into sex cells. When the offsprings reproduce, they can only transmit one of their trait which is inherited from their parents. Genetic drift causes number of changes in a population but only in a few generations, especially if the population is very little. Genetic drift also reduces the genetic variation in a population.
Review articles are the summary of current state of understanding on a particular research topic. They analyze or discuss research previously published by scientist and academicians rather than reporting novel research results.
Review article comes in the form of systematic reviews and literature reviews and are a form of secondary literature. Systematic reviews determine an objective list of criteria, and find all previously published original research papers that meet the criteria. They then compare the results presented in these papers. Literature reviews, by contrast, provide a summary of what the authors believe are the best and most relevant prior publications.
The concept of "review article" is separate from the concept of peer-reviewed literature. It is possible for a review to be peer-reviewed, and it is possible for a review to be non-peer-reviewed.