Which one of the following statements regarding principles of linkage mapping in plants is correct?
1
Genetic markers would always show higher recombination frequencies when they are closer to each other than if they are far apart.
2
The genetic distance between two markers is a true representation of the physical distance between them.
3
An ideal mapping population for a self-pollinating species is generated using polymorphic parents that are inbred lines.
4
An F2 mapping population would segregate in a 1 : 2 : 1 ratio for a dominant marker.