The mammalian egg encounters a heterogeneous population of sperm. Some sperm have undergone the acrosome reaction in or near the cumulus, whereas others have not. The egg have pathways for accepting both types of capacitated sperm.

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.

TLS Online TPP Program

#Id: 104

#Unit 5. Developmental Biology

Syncytial specification uses elements of both autonomous and conditional specification.