Abstract
The basic physical and functional unit of heredity; made up of DNA, they act as instructions to make proteins. There are about 20,000–25,000 genes in humans, with size varying from a few hundred DNA bases to more than 2 million bases. Most genes are the same in all people; less than 1% differ. Each person has two copies of each gene, one inherited from each parent. Each chromosome contains many genes.
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Tsang, S.H., Sharma, T. (2018). Glossary of Relevant Genetic and Molecular/Cell Biology. In: Tsang, S., Sharma, T. (eds) Atlas of Inherited Retinal Diseases. Advances in Experimental Medicine and Biology, vol 1085. Springer, Cham. https://doi.org/10.1007/978-3-319-95046-4_7
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DOI: https://doi.org/10.1007/978-3-319-95046-4_7
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