A genetic marker is a gene or DNA sequence with a known location on a chromosome that can be used to identify individuals or species. It can be described as a variation (which may arise due to mutation or alteration in the genomic loci) that can be observed. A genetic marker may be a short DNA sequence, such as a sequence surrounding a single base-pair change (single nucleotide polymorphism, SNP), or a long one, like minisatellites.
... Genetic markers also play a role in genetic engineering, as they can be used to produce normal, functioning proteins to replace defective ones ... cells, a small number of which take up the genetic material and reproduce the new DNA sequence ...
Famous quotes containing the words marker and/or genetic:
“Personal change, growth, development, identity formationthese tasks that once were thought to belong to childhood and adolescence alone now are recognized as part of adult life as well. Gone is the belief that adulthood is, or ought to be, a time of internal peace and comfort, that growing pains belong only to the young; gone the belief that these are marker eventsa job, a mate, a childthrough which we will pass into a life of relative ease.”
—Lillian Breslow Rubin (20th century)
“Nature, we are starting to realize, is every bit as important as nurture. Genetic influences, brain chemistry, and neurological development contribute strongly to who we are as children and what we become as adults. For example, tendencies to excessive worrying or timidity, leadership qualities, risk taking, obedience to authority, all appear to have a constitutional aspect.”
—Stanley Turecki (20th century)