4) A sequence of bases on DNA that code for a specific protein.
Gene:
- A gene is the basic physical and functional unit of heredity.
- Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. However, many genes do not code for proteins.
- Alleles are forms of the same gene with small differences in their sequence of DNA bases.
- Every person has two copies of each gene, one inherited from each parent.
Thus, option 4 is correct.
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