scientists are using mice as a model organism to study neurological diseases. a mutant mouse has fewer glial cells in the brain compared to wild type mice. scientists cross this mutant mouse to pure-breeding wild type mice. in the f1 generation, 11 mice are wild type and 12 mice have fewer glial cells. what is the normal function of this gene? (consider our example of sbe1 promoting starch formation in mendel's round seeds. what sentence would you use to describe what this gene is doing?)