Read the following statements carefully: A. The bivalent formed during zygotene is clearly visible as a tetrad in the pachytene stage. B. Crossing over is an enzyme-mediated process involving recombinase, occurring in the diplotene stage. C. The beginning of diplotene is recognised by the dissolution of the synaptonemal complex. D. In oocytes of some vertebrates, diakinesis can last for months or years. How many of t

Step-by-step solution

Statement A is correct: Bivalents are formed during zygotene, but the four chromatids become distinct and clearly appear as tetrads in the pachytene stage. Statement B is incorrect: Crossing over is indeed an enzyme-mediated process involving recombinase, but it occurs during the pachytene stage, not diplotene. Statement C is correct: The beginning of diplotene is recognised by the dissolution of the synaptonemal complex. Statement D is incorrect: In oocytes of some vertebrates, it is the diplotene stage (not diaki