Cialis redirects here. For the Central Asian kingdom, see Karasahr. Tadalafil (INN) is a PDE5 inhibitor marketed in pill form for treating erectile dysfunction (ED) under the name Cialis see-AL-iss, and under the name Adcirca ad-SUR-kuh for the treatment of pulmonary arterial hypertension.
Quick Answer. The synapsis process occurs in the prophase I stage of meiosis. In synapsis, replicated homologous chromosomes link, which become known as a tetrad. Crossover between two pairs of tetrads can occur at any time. Continue Reading.
Genetic recombination happens in meiosis 1, specifically in prophase 1, when crossing over happens between the two inner chromatids of a synapsed pair of homologous chromosomes. 3. Replication of DNA happens BEFORE meiosis begins, so it doesn't happen in either meiosis 1 or meiosis 2. It happens during interphase.