A corn (Zea mays)mutant is developed that is impaired in magnesium uptake.The most likely phenotypic expression would be

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Magnesium is a necessary component of chlorophyll, the pigment responsible for capturing light energy in photosynthesis. Without sufficient magnesium, chlorophyll synthesis would be impaired, leading to chlorosis (yellowing) of the leaves, especially in the older leaves where magnesium is most heavily used.

A Corn (Zea Mays)mutant Is Developed That Is Impaired in Magnesium