I am not a specialist in crypto structures,but when bitcoin price goes up,altcoins prices goes up too after unknown time or not

Because always when btc rises,altcoins to started dropped down.
as far as i know,that bitcoin is not dependent of altcoins, sometimes if bitcoin price rise high the altcoins rise up to.but their are times that if bitcoin dump, the altcoins is going high.maybe this two coins have its own dynamic process.this is the scenario of the block chain industry
have its own idea, and fundamental but same purpose in crypto world.