Wednesday, January 26, 2011

Gene Maps

Geneticist make 3 types of maps

Linkage map
Physical map
Sequence map

All three locate loci along molecules of DNA ( Chromosomes)
Although they map the same information they reveal different levels of detail and use different units of measure.

Linkage maps
Maps constructed from recombination data and distance measured in Centi Morgan. Distances are not accurate, they are relative.

Physical Maps
Molecular counterpart of linkage maps and distance measured is actual number of base pairs that separate 2 genes.

Sequence Maps
Shows the order of nucleotides in a piece of DNA. Sequence information isderived from genome sequencing projects.