What do identical DNA cells develop differently?

What do identical DNA cells develop differently?

• A. Different traits
• B. Identical traits
• C. Some traits more than others
• D. Randomly

Answer: (A)

Cells with identical DNA can develop different traits because gene expression is regulated. During development, signals from the cell’s environment and regulatory proteins turn different genes on or off, guiding cells to take on specific roles—neurons, muscle cells, skin cells, and so on. Epigenetic marks can also influence which genes are accessible for transcription, shaping each cell’s traits even though the DNA sequence is the same. So, the same genetic code can lead to a variety of cell types and characteristics. The idea that traits would be identical, or that differences arise randomly, doesn’t fit with how controlled gene regulation and development work.

Cells with identical DNA can develop different traits because gene expression is regulated. During development, signals from the cell’s environment and regulatory proteins turn different genes on or off, guiding cells to take on specific roles—neurons, muscle cells, skin cells, and so on. Epigenetic marks can also influence which genes are accessible for transcription, shaping each cell’s traits even though the DNA sequence is the same. So, the same genetic code can lead to a variety of cell types and characteristics. The idea that traits would be identical, or that differences arise randomly, doesn’t fit with how controlled gene regulation and development work.