Cell Cycle And Cell Division

During oogenesis, the following events occur in sequence:
A. Primary oocyte undergoes meiotic division
B. Secondary oocyte remains arrested until fertilization
C. Oogonia undergo mitotic divisions
D. Primordial germ cells undergo mitosis
Choose the correct answer from the options given below:

Which of the following event occurs during the Diplonema/Diplotene stage of meiosis ?

Separation of two different alleles from each other during gamete formation in a heterozygote follows :

In normal cells, progress through the cell cycle is tightly regulated and each step must be completed before the next step can begin. There are at least three distinct points in the cell cycle at which the cell monitors external signals and internal equilibrium before proceeding to the next stage. These are the G1/S, the G2/M and M checkpoints.
In addition to regulating the cell cycle at the checkpoints, the cell controls progress through the cell cycle by means of two classes of proteins: cyclins and cyclin-dependent kinases (CKDs).
Based on the above context, answer the following questions :

Actinomycin D inhibits :