so if creature needs protain C for for adaptation, and gene A-B is formed for it, where C is derived from A, and B is just complementary. and d.n.a. is antiparalel, in strand where is A will be also B and will derive protain D... why? how? maybe it is lethal?

Question

anonymous · Answer

The process of forming (DNA> mRMA > protein) protein is not straight as it looks. First the cell has to decide which part of DNA to be processed and when (read about cell cycle) and this is also controlled by proteins derived from DNA. This makes sure that only a specific part of the DNA (or which strand) is processed. This mRNA and protein are going through various types of modifications after its formation. Making specific proteins from the desired part of the DNA is a difficult task because of these problems.

anonymous · Answer

So this creature needs protein C which is encoded by gene A. If gene B is complementary, that means B is not identical to A. Actually it is a totally  different gene from gene A, and has a totally different regulation system upstream. Seems like you confused complementary with identical.

blues · Answer

Protein with an e, not an a.