Embryogenesis

Question 1

How does epigenesis work?

Answer 1

The theory that an embryo develops progressively from an undifferentiated egg cell.

Mosaic Development:
Cell division divides egg into parts of different potential

Regulative development:
Communication between cells instructs development
-complexity gradually emerges
-cell sends signals to determine where they are

Question 2

Mosaic or regulative development?

Answer 2

Both occur.

Usually start with some mosaic, then use cell communication.

Question 3

How does cell signalling work in embryogenesis?

Answer 3

Morphogens - different concentrations of same molecule give different information.