A deficiency in glucose 6‑phosphate dehydrogenase causes a dearth of in all cells, but this is particularly problematic in red blood cells because they lack mitochondria. Its primary role in red blood cells is to maintain levels of Red blood cells with low levels of this compound are more susceptible to .

In the case of red blood cells, a deficiency in glucose 6‑phosphate dehydrogenase could cause these cells to break down - in response to some specific trigger.

Explanation:

Generally, it may be the case that the person with this deficiency might not show any  symptoms. However, once triggered, all the functions for which red blood cells play a critical role will be compromised - for instance, the person may experience shortness of breath, paleness of skin, fatigue etc. These are related to red blood cells function of transporting oxygen and carrying hemoglobin.

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covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds.