Fitness is as the number of offspring an individual leaves in the next generation.

TLS Online TPP Program

#Id: 98

#Unit 5. Developmental Biology

In conditional specification the array of interactions it has with its neighbors, which may include: 

cell-to-cell contacts (juxtacrine factors)

secreted signals (paracrine factors)

physical properties of its local environment (mechanical stress)

TLS Online TPP Program

#Id: 99

#Unit 5. Developmental Biology

In Conditional Specification

Prospective potency is greater than prospective fate.

TLS Online TPP Program

#Id: 100

#Unit 5. Developmental Biology

Massive cell rearrangements and migrations precede or accompany conditional specification.

TLS Online TPP Program

#Id: 101

#Unit 5. Developmental Biology

Conditional Specified cells

Capacity for "regulative" development

Allows cells to acquire different functions

TLS Online TPP Program

#Id: 102

#Unit 5. Developmental Biology

If conditionally specified cells are removed from the embryo, the remaining cells can regulate and compensate for the missing part.

TLS Online TPP Program

#Id: 103

#Unit 5. Developmental Biology

Hans Driesch’s pressure-plate experiment implies that cell interaction is critical for normal development.