The Genetic Chromosome
The concept of the genetic chromosome evolved from studies of the behavior of genetic markers during the propagation of organisms.
The genetic chromosome is represented by a genetic map.
- Genetic maps are unbranched lines or circles with marks indicating
the relative positions of genetic markers.
- Genetic markers are genetically determined traits or characters that are polymorphic
in the population being studied. Polymorphic means that at least two forms of the trait occur in the population.
- If two markers are genetically linked, they are on the same genetic map, also called a linkage map. The set of all markers on the same linkage map is called a linkage group.
- If two markers are not genetically linked they are said to be
unlinked markers and belong to different linkage groups.
- Phenotypic markers can be assigned to locations on molecularly marked genetic chromosomes.
Chromosomes can also be thought of as morphological entities or as DNA molecules.
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This is page 111 of Molecular Genetics by Ulrich Melcher, ©1997, 1998, 2010
E-mail inquiries to U. Melcher------------Last Updated: 24 August, 2010