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Diploid and Haploid

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A diploid cell holds two matched sets of chromosomes, one from each parent; a haploid cell holds a single set.

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A human somatic cell is diploid with 46 chromosomes, while a human sperm or egg is haploid with 23.

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A haploid cell is not merely a diploid cell missing chromosomes — it holds one complete set, not half of a damaged one.