Well in such a case the cell will not actually undergo oxidative phase of the pencils phosphate pathway. What will happen is once again we begin with that glucose six phosphate molecule and now we undergo the glycolytic pathway. And so what we form is fructose six phosphate molecules as well as glyceroaldehyde three phosphate molecules. Why? Well, because now our cell can use the fructose six phosphate and the glyceroaldehyde three phosphate and it can undergo the reverse steps of non oxidative phase of the penthouse phosphate pathway because combining these two will allow the cell to actually build the much needed ribose biphosphate molecules which it can then use to build those DNA molecules nucleic acids. So under such conditions when the cell needs the ribose phyphosphate much more than it needs the NADPH molecules, the glucose six phosphate metabolite is converted via the glycolytic pathway into gap glyceroaldehyde three phosphate and fructosex phosphate.