A gen is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions khổng lồ make molecules called proteins. However, many genes vày not code for proteins. In humans, genes vary in form size from a few hundred DNA bases to more than 2 million bases. An international retìm kiếm effort called the Human Genome Project, which worked to determine the sequence of the human genome & identify the genes that it contains, estimated that humans have between 20,000 and 25,000 genes.Quý khách hàng sẽ xem: Genetic makeup là gì

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 khổng lồ each person’s unique physical features.

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Scientists keep traông chồng of genes by giving them quality names. Because gen names can be long, genes are also assigned symbols, which are short combinations of letters (& sometimes numbers) that represent an abbreviated version of the gen name. For example, a gene on chromosome 7 that has been associated with cystic fibrosis is called the cystic fibrosis transmembrane conductance regulator; its symbol is CFTR.

Genes are made up of DNA. Each chromosome contains many genes.


Credit: U.S. National Library of Medicine

For more information about genes:

More information about how genetic conditions and genes are named is also available from Genetics.

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The Centre for Genetics Education offers a fact sheet that introduces genes and chromosomes.

The Tech Museum of Innovation at Stanford University describes genes and how they were discovered.


Genetics trang chủ Reference has merged with Genetics Home Reference nội dung now can be found in the "Genetics" section of Learn more

The resources on this site should not be used as a substitute for professional medical care or advice. Users with questions about a personal health condition should consult with a qualified healthcare professional.

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