Cell differentiation depends on changes in (BLANK) expression.

Gene

Explanation:

In different cell types, different combinations of genes are active and inactive. The genes that are ON in a skeletal muscle cell will be different than the genes that are ON in a neuron - allowing them to perform unique function.

Therefore, the differentiation of a stem cell into a specialized cell requires changes in gene expression. These cell-type specific patterns in gene expression are what determines the identity of differentiated cells.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

voluntary muscles are controlled by the cerebellum.