Why the use of callus is often avoided for micropropagation?

Question

this question is from Plant Tissue Culture.

Answer 1

Callus is undifferentiated mass of cells. Regeneration through callus is possible but the plants which are developed from the callus tissue are often show a lot of variation. Micropropagation technique expects the plants of uniform nature which is not available through callus regeneration.

Answer 2

Usually you will mainly get roots from a callus.

This will slow growth and subdivision in microcultivation