lacZ encodes for b-galactosidase, a tetramer of 500 kD. The enzyme breaks lactose is cleaved into glucose and galactose. This enzyme also produces an important byproduct, b-1,6-allolactase.

TLS Online TPP Program

#Id: 7405

#Unit 5. Developmental Biology

Dorsal protein is a transcription factor that activates the genes that generate the ventrum.

TLS Online TPP Program

#Id: 7406

#Unit 5. Developmental Biology

The highest concentrations of Dorsal in the most ventral cell nuclei, become the mesoderm

TLS Online TPP Program

#Id: 7407

#Unit 5. Developmental Biology

The segment polarity genes encode proteins that are constituents of the Wnt and Hedgehog signaling pathways.

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#Id: 7408

#Unit 5. Developmental Biology

The engrailed gene is activated in cells that have high levels of the Even-skipped, Fushi tarazu, or Paired & repressed in cells that have high levels of Odd-skipped, Runt, or Sloppy-paired

TLS Online TPP Program

#Id: 7409

#Unit 5. Developmental Biology

The wingless (wg) gene is activated in those bands of cells that receive little or no Even-skipped or Fushi tarazu protein, but which do contain Sloppy-paired

TLS Online TPP Program

#Id: 7410

#Unit 5. Developmental Biology

Once wingless and engrailed expression patterns are established in adjacent cells, this pattern must be maintained to retain the parasegmental periodicity of the body plan.