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Why do chromosomes vary in size?

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Chromosomes in an organism can come from different species, so it is highly likely that the sizes are different. But if you ask why the sizes of chromosomes varies among species, well, that is another difficult “why” question. read more

In other words, each person actually possesses two copies of chromosome 1, two copies of chromosome 2, and so on. Human cells contain 23 pairs of chromosomes. Most of an organism's chromosomes—generally all except for one pair—are called autosomes, which are the same in males and females. read more

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