Every person has two copies of each gene, one inherited from each parent. Most genes are the same in all people, but a small number of genes (less than 1 percent of the total) are slightly different between people. Alleles are forms of the same gene with small differences in their sequence of DNA bases. These small differences contribute to each person’s unique physical features.
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I would say this is an expository text.
The nucleus of a cell is found in the cytoplasm, but is not part of the cytoplasm. The nucleus and cytoplasm work together to keep a cell alive.
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-Payshence