Crossing over is the swapping of genetic material that occurs in the germ line. During the formation of egg and sperm cells, also known as meiosis, paired chromosomes from each parent align so that similar DNA sequences from the paired chromosomes cross over one another. Crossing over results in a shuffling of genetic material and is an important cause of the genetic variation seen among offspring.
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Genetic drift can cause big losses of genetic variation for small populations. Populationbottlenecks occur when a population's size is reduced for at least one generation. describes changes in population genetics in which extreme values for a trait are favored over intermediate values
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The definition for capillary action is... the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
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