Question

research has shown that certain body cells, known as stem cells, can develop into a variety of specialized cells. various factors can cause stem cells to develop into different types of mature cells. these different types of mature cells result from
1 different antibodies and mitotic cell division
2 identical genetic codes and meiotic cell division
3 different environments of the cells and the functioning of different parts of the genetic code
4 similar steps in the development of the cells and a reduction in the number of chromosomes in each cell
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Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Antibodies are produced by specialized cells (B - cells), and mitotic division alone doesn't explain cell specialization. Stem cells divide mitotically but differentiate, so this is incorrect.
• Option 2: Stem cells have identical genetic codes. During development, different genes are expressed due to different environments and functional needs of different cell parts, leading to specialization. This matches the concept of cell differentiation.
• Option 3: The genetic code (DNA sequence) in a single organism's cells is mostly identical. Different cells don't have different genetic codes (except for mutations, which aren't the main cause of normal cell specialization). So this is incorrect.
• Option 4: Mitotic cell division (which stem cells undergo) doesn't reduce chromosome number (meiosis does). And the development steps for different cells from stem cells involve differential gene expression, not a reduction in chromosome number. So this is incorrect.

Answer:

1. identical genetic codes and mitotic cell division