Cellular respiration is carried out in the presence of oxygen (aerobic conditions) or the absence of oxygen (anaerobic conditions). Determine whether each event occurs under aerobic conditions, anaerobic conditions, or both aerobic and anaerobic conditions.

The phenomenon of generating cellular energy in the presence of oxygen is termed as aerobic respiration. In the process of aerobic respiration, the generation of 36 ATPs takes place. The initial step of aerobic respiration is glycolysis, which is followed by the citric acid cycle and electron transport chain.  

On the other hand, the phenomenon of generating energy in the absence of oxygen is termed as anaerobic respiration. It is a comparatively faster process in comparison to aerobic respiration in which the generation of two ATPs takes place. The phenomenon of anaerobic respiration takes place within the cytoplasm, where energy is discharged from glucose by the process of glycolysis, and the recycling of NADH takes place back to NAD+ by the process of fermentation.  

Thus, it can be seen that the process of glycolysis takes place both in aerobic and anaerobic conditions.  

the correct answer is phenotype

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