Why does crossing over occur more often between two distantly linked genes than between two closely linked genes on the same chromosome?

How had the study of mitosis affected scientists knowledge of cancer

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

How does the human body lever work?