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.
Because pairing and recombination occur during the first meiotic prophase, .... During meiosis, errors in chromosome distribution may occur and lead to chromosomal ... This is â¦ a principal source of the difference between offspring and parents. ... this process (crossing over) is also a source of genetic variation. ... How does crossing-over relate to genetic recombination?