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.
exists and is an alternate of . The most common form of synapsis occurs in the nuclei of cells undergoing the type of cell division called meiosis. It occurs during prophase I (i.e. prophase of the first meiotic division). Prophase I is subdivided into five stages, and synapsis occurs in the second of these (zygotene).