(I need help with conducting research to support my claim based on genetic variation) My claim:
Inherited genetic variations are not caused by not one but numerous factors. One source that can be the cause of inherited genetic variation is genetics. They are caused by the crossing over and assortment of sex cells during meiosis. The random crossing over of sex cells can also be a source of inherited genetic variation. A third source of inherited genetic variation is Mutation. Not all mutations are always harmful. One last source that can also influence and be the cause of inherited genetic variations is environmental factors. Variation within a population can be influenced by factors such as an organism's environment and behavior.

Evidence and research I gathered so far:
First of all, what exactly is genetic variation? “Genetic variation refers to the differences in traits among individuals within a species,” stated in Genetic Variation, a government website.
One source that can be the cause of inherited genetic variation is genetics. They are caused by the crossing over and assortment of sex cells during meiosis.