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.
Genetic variation is a term used to describe the variation in the DNA sequence in each of our genomes. Genetic variation is what makes us all unique, whether in terms of hair colour, skin colour or even the shape of our faces. There are lots of different mutations that can occur in our DNA.