Production | Isoquants can be convex, linear, or L-shaped. What does each of these shapes tell you about the nature of the production function? What does each of these shapes tell you about the MRTS?

Isoquants can be convex, linear, or L-shaped. 

What does each of these shapes tell you about the nature of the production function? 

What does each of these shapes tell you about the MRTS?