Systemic lupus erythematosus, often abbreviated as SLE or lupus, is a systemic autoimmune disease (or autoimmune connective tissue disease) in which the bodyâs immune system mistakenly attacks healthy tissue.ystemic lupus erythematosus, often abbreviated as SLE or lupus, is a systemic autoimmune disease (or autoimmune connective tissue disease) in which the bodyâs immune system mistakenly attacks healthy tissue.
Natural selection will only cause evolution if there is enough genetic variation in a population. Before the discovery of Mendelian genetics, one common hypothesis was blending inheritance. But with blending inheritance, genetic variance would be rapidly lost, making evolution by natural selection implausible.
The primary mechanism of significant change in DNA is mutation. That DNA is subject to mutation is a fact and it has been directly observed. In addition, many of the mechanisms of mutation are understood including mutations that can lead to drastic changes in an organism.This means we understand some of the mechanisms by which changes in an organism can be affected.hese facts, that 1) DNA determines the nature of an organism and that 2) there are mechanisms through which DNA can be modified, are the basis of evolution. It is through these facts that evolution happens.