Can Frequency Analysis Be Performed on Polyalphabetic Ciphers?

Frequency analysis can be performed on polyalphabetic ciphers which makes it weaker than monoalphabetic ciphers.

Can frequency analysis be performed on Polyalphabetic ciphers which makes it weak?

Multiple cipher alphabets are required to increase security. ... In mono alphabetic what happens is that there is a fixed substitution but poly alphabetic cipher uses multiple substitution therefore frequency analysis when performed poly alphabetic ciphers makes it weaker.

Can frequency analysis identify the Polyalphabetic substitution Ciphertexts?

Although Frequency Analysis works for every Monoalphabetic Substitution Cipher (including those that use symbols instead of letters), and that it is usable for any language (you just need the frequency of the letters of that language), it has a major weakness.