Cells in an organism can develop in different ways to perform different tasks.
Noncoding sections are used in dna fingerprinting, as they are easily identifiable, abundant, and passed on from parent to child through genes. If you can get a relative with similar noncoding sections, then you could compare similarities in the DNA.
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A benefit of crossing over is that it maintains genetic diversity within a population, allowing for millions of different genetic combinations to be passed from parents to offspring. Genetic variability is very important to the long-term survival of a species
