Answer:
Separately in Nucleus and cytoplasm,
Simultaneously in the cytoplasm
Explanation:
In eukaryotes transcription and translation occurs separately in the nucleus and cytoplasm respectively. Transcription occurs inside the membrane bound nucleus and the mRNA transcript is transported to the cytoplasm for translation.
In prokaryotes, because prokaryotic cells lack a membrane bound nucleus, transcription and translation occurs simultaneouslyin the cytoplasm. This means that translation of mRNA begins even while the transcription of the transcript is still active.