Mind Maps

Mind Mapping refers to :

Introduction|Physical Maps|Thematic Maps|Direction|Symbols|Sketch|Plan|Summary

Chromosome maps/genetic maps were first prepared by

A has 3 maps and B has 9 maps.All the 12 maps being distinct.Determine the number of ways in which they can exchange their maps if each keeps his initial number of maps.

What map unit (Centimorgan) is adopted in the construction of genetic maps?