Some symptoms of a complex kidney cyst include abdominal and flank pain, a palpable growth and hematuria. These symptoms may manifest when a complex renal cyst arises from a simple kidney cyst due to complications or enlargement, notes the Journal of the American Society of Nephrology. Continue Reading.
1 Mutations are changes in the DNA. 2  A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations. 3  Gene flow is any movement of genes from one population to another and is an important source of genetic variation.ithout genetic variation, some of the basic mechanisms of evolutionary change cannot operate. There are three primary sources of genetic variation, which we will learn more about: 1  Mutations are changes in the DNA.
There are measurable mutation rates and that there can be a genetic variation for mutation rates; mutator strains of bacteria exist. Mutations in the replication or repair machinery of DNA can alter mutation rates.