Which of the following best explains why cells that contain the same genetic material do not develop into the same types of cells?
A. Because chemical signals that are released during the cell cycle can result in the linking of similar genes
B. Because internal or external stimuli can trigger the activation of specific genes in the DNA of cells
C. Because messenger RNA is converted to transfer RNA when cell differentiaton begins
D. Because random mutations can occur in the DNA of cells during early embryonic development

The statement 'internal or external stimuli trigger the activation of specific genes in the DNA of cells' BEST explains why cells having the same genetic material do not develop into the same cells (Option B).

Cell specialization refers to the process by which common stem cells differentiate to produce specialized cells that perform specific functions.

Cell specialization is caused by differential gene expression patterns that lead to the expression of different proteins in different types of cells.

For example, hematopoietic stem cells differentiate into red blood cells to transport oxygen in the blood by expressing the hemoglobin gene, whose protein binds to oxygen.

In conclusion, the statement 'internal or external stimuli trigger the activation of specific genes in the DNA of cells' BEST explains why cells having the same genetic material do not develop into the same cells (Option B).

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