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Can fork() function be used to replicate a multithreaded process. And if so, will all threads be exactly the same and if not, why not. If replication can't be done through fork, is there any other function which can do it for me?
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No, the child will only have one thread. Forking a threaded process is not trivial. (See this article Threads and fork(): think twice before mixing them for a good rundown).
I don't know of any way of cloning a process and all its threads, I don't think that's possible on Linux.
After a fork, only one thread is running in the child. This is a POSIX standard requirement. See the top answer to the question fork and existing threads ?.
No.
A fork creates a new process with his own thread(s), copies the file descriptor and the virtual memory.
A child process does NOT share the same memory with his father. So this is absolutely not the same.