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:

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.