Question

a multicellular organism is formed from a single fertilized egg. if the dna in every cell of the organism is the same, how do the cells become differentiated?
a the allele on chromosomes change in different cells.
b the length of dna varies in different cells.
c different sections of genes are expressed in different cells.
d different mutations arise in different cells.

Explanation:

Cell differentiation occurs due to gene expression. All cells have the same DNA (same alleles, same length). Mutations are rare and not the cause of normal differentiation. Gene expression (which genes are turned on/off) varies among cells, leading to different cell types.

Answer:

C. Different sections of genes are expressed in different cells.