Bitcoin is one of the best crypto currency in the market so it also dominated crypto market. There are many reason for crypto currenxy ups and down. But i think bitcoin price ups and down sometimes may create effect to the market. In my few years experience i have seen that when the price of bitcoin fall then the altcoin also fall one the other hand when the price of bitcoin rise all other coin grow up gradually. I think it happen in the crypto market naturally. So in my opinion all altcoins sometimes dependent on bitcoin.