Explain the relationship between crossing over and genetic variation

Crossing over can create genetic variation. Crossing over is when chromosomes cross over they give + take a part of another chromosome which can create different variation in genes.

Crossing over is the process by which genetic material is exchanged by non-sister chromatids during meiosis.  Crossing over results in a new combination of genetic information for the cell for a specific trait.  Crossing over ensures that organisms are not identical from generation to generation.  Genetic recombination allows for a variation in genetic material that is passed through the generations.

Explanation:

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.