Masculine ends in consonant, feminine ends in -я, -а and neuter ends in -o, -e. There are few exceptions. (Й is a consonant). Also adjectives will end in -ий/ій, -а/я, -о/е/є which can help
Re pronunciation of донька -- should the emphasis be decisively on the last syllable?
Forvo is a great resource for questions on pronunciation.
The pronoun "it" does not agree with the noun, "daughter" in English. "It" is neutral. For the displayed answer, the sentence should translate as, "Whose daughter is this?" I can't figure out how to report/make suggestions on the mobile platform, I apologize!