Question

In Zygotic cleavage, How are the enzymes required for replication, are made available to the rapidly dividing cells, which lack G1 and G2 phases of cell cycle

Answer 1

there are so many factors that make these enzymes available during the S phase...at the other times they are inhibited. for eg...Scyclin CDK is a kinase which phosphorylates imp molecules so as to trigger the replication.