What Is the Difference Between a Linkage Map and a Physical

Multiple Choice

What is the difference between a linkage map and a physical map?

A) Markers are spaced by recombination frequency on a linkage map and by number of base pairs on a physical map.
B) The ATCG order and sequence must be determined for a linkage map but not for a physical map.
C) A linkage map shows how each gene is linked to every other gene, but a physical map does not.
D) Distances must be calculable in units such as nanometers on a physical map but not on a linkage map.
E) There is no difference between the two except in the type of pictorial representation.