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.
Homologous chromosomes split during the anaphase stage of Meiosis 1. Related Questions. Do all of the crossing-over events during meiosis happen only on one of the sister chromatids (and one of the sister chromatids of the other h... Why do the 19, 20, and 21 chromosomes have risks of not separating more than the others? Do non-homologous sex chromosomes undergo synapsis?