genetic marker

any distinct inheritable indicator of identity and ancestry.
a chromosomal landmark or allele that allows for the tracing of a specific region of DNA, as in the study of recombination.
Also called marker, marker gene.

1945–50 Unabridged
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World English Dictionary
genetic marker
a gene with two or more alternative forms, producing readily identifiable variations in a particular character, used in studies of linkage, genetic mapping, and identification of the presence of other genes that are closely linked to, and therefore usually inherited with, it

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

genetic marker n.
A gene phenotypically associated with a particular, easily identified trait and used to identify an individual or cell carrying that gene.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
genetic marker  
A gene or DNA sequence having a known location on a chromosome. Genetic markers associated with certain diseases can be used to determine whether an individual is at risk for developing an inherited disease.
The American Heritage® Science Dictionary
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Example sentences
If there was a genetic marker for hypocrisy, now that would be something.
Scientists don't yet know exactly how this genetic marker contributes to differences in brain size or in behavior.
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