שאלה | 20. Which of the following best describes the molecular events of the Maternal-to-Zygotic Transition (MZT) in early vertebrate development?

20. Which of the following best describes the molecular events of the Maternal-to-Zygotic Transition (MZT) in early vertebrate development?

		The MZT is triggered by the fertilization-induced increase in calcium, leading directly to the transcription of maternal mRNAs and a halt in DNA replication
		The MZT is characterized by widespread activation of maternal transcription factors and global translation of stored maternal RNAs without any RNA degradation.
		The MZT involves the degradation of maternal mRNAs, activation of the zygotic genome, and regulation by small RNAs such as microRNAs
		The MZT marks the point at which maternal mitochondria begin to replicate, initiating the energetic shift required for gastrulation.
		The MZT initiates only after gastrulation, when maternal mRNAs are no longer needed and zygotic transcription is suppressed.