A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions lớn make molecules called proteins. However, many genes do not code for proteins. In humans, genes vary in kích thước from a few hundred DNA bases to more than 2 million bases. An international research effort called the Human Genome Project, which worked lớn determine the sequence of the human genome and identify the genes that it contains, estimated that humans have sầu between đôi mươi,000 and 25,000 genes.

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Every person has two copies of each ren, 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 lớn each person’s unique physical features.

Scientists keep traông chồng of genes by giving them quality names. Because gene names can be long, genes are also assigned symbols, which are short combinations of letters (& sometimes numbers) that represent an abbreviated version of the ren name. For example, a gen 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:

danangmoment.com Genetics provides consumer-friendly gene summaries that include an explanation of each gene"s normal function and how variants in the gene cause particular genetic conditions.

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More information about how genetic conditions & genes are named is also available from danangmoment.com Genetics.

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

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

The Virtual Genetics Education Centre, created by the University of Leicester, offers additional information on DNA, genes, & chromosomes.


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

The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health.

U.S. National Library of Medicine 8600 Rockville Pike, Bethesdomain authority, MD 20894 U.S. Department of Health & Human Services National Institutes of Health

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