DNA-The Double Helix. Answer Key. 1. Write out the full name for DNA. D eoxyribo N ucleic A cid. 2. What is a gene?. A gene is a segment of DNA that codes for a particular protein which in turn codes for a trait. 3. Where in the cell are chromosomes located?.
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15. How do some cells become brain cells and others become skin cells, when the DNA in ALL the cells is exactly the same. In other words, if the instructions are exactly the same, how does one cell become a brain cell and another a skin cell?