TLS Online TPP Program

#Question id: 15853


In XY cells, the early promoter is not active and there is no early Sxl protein because-

#Unit 5. Developmental Biology
  1. The X-encoded transcription factors have reached the threshold to activate the promoter
  2. The X-encoded transcription factors haven’t reached the threshold to activate the promoter
  3. The Y-encoded transcription factors haven’t reached the threshold to activate the promoter
  4. The Y-encoded transcription factors haven’t reached the threshold to activate the promoter