Answer:
B
Explanation:
Remember that all the cells of the organism began from a single zygote that divided mitotically to produce the whole organism. Therefore all the cells of an organism contain the same genetic material. The difference in the type of cells that make up different tissues and organs is from the differential differentiation of cells during embryology. This occurs because through autocrine signaling between the cells during the development of the embryo. Through communication, the different cells are able to silence particular genes in their DNA according to the fate of the particular cells.
Therefore, different cells will produce different proteins based on the differential expression of the genes in their DNA. Proteins are responsible for the phenotype of the cell hence the difference even in structure of the cells in different tissues.
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