PATHOLOGY

Detailed explanation-1: -The cell types in a multicellular organism become different from one another because they synthesize and accumulate different sets of RNA and protein molecules. They generally do this without altering the sequence of their DNA.

Detailed explanation-2: -With a few exceptions1 all cells of a multicellular organism have the same DNA sequence. However, the cells of the multicellular organism have very different patterns of gene expression and thus make very different groups of proteins.

Detailed explanation-3: -However, the expression of these genes is different for each cell because the genes not needed are.

Detailed explanation-4: -Different cells in a multicellular organism may express very different sets of genes, even though they contain the same DNA. The set of genes expressed in a cell determines the set of proteins and functional RNAs it contains, giving it its unique properties.