Crassulacean acid metabolism (CAM). Temporal separation of CO2 uptake from photosynthetic reactions: CO2 uptake and fixation take place at night, and decarboxylation and refixation of the internally released CO2 occur during the day. The adaptive advantage of CAM is the reduction of water loss by transpiration, achieved by the stomatal opening during the night.

TLS Online TPP Program

#Id: 7371

#Unit 5. Developmental Biology

The transcription factors encoded by the pair-rule genes activate the segment polarity genes, whose mRNA and protein products divide the embryo into 14-segment-wide units, establishing the periodicity of the embryo. 

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#Id: 8975

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 2013

#Unit 8. Inheritance Biology

TLS Online TPP Program

#Id: 6943

#Unit 8. Inheritance Biology

Inversion homozygous - No special problems arise in meiosis. Inversion heterozygous - Two chromosomes form an inversion loop

TLS Online TPP Program

#Id: 1586

#Unit 5. Developmental Biology

Once the PMZ has formed, it prevent other regions of the margin from forming their own primitive streaks.