which genes are present how many copies of each gene are present which genes are active what protein is produced by a gene
I gave my students this multiple choice question: What characteristic of DNA results in cell differentiation in developing embryos?

Only one answer is correct among these 4 choices:
- which genes are present
- how many copies of each gene are present
- which genes are active
- what protein is produced by a gene

Could you tell me which one is correct?

which genes are active