Aetna CEO: Obamacare In A 'Death Spiral' Heading Into 2018. Aetna and Humana have called off their deal amid government concerns over competition. Here's a look back at six pivotal moments that led to this. Aetna and Humana have called off their deal amid government concerns over competition.
For the plant genus, see Synapsis (plant). Synapsis (also called syndesis) is the pairing of two homologous chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them. Synapsis takes place during prophase I of meiosis.
Rating Newest Oldest. Best Answer: A. prophase I That's when the chromosomes are condensed from chromatin and the homologous chromosomes synapse. They line up on the equator of the spinde during metaphase I, and they are already synapsed into tetrads at that point, so they formed the tetrads during prophase I. Source(s): I teach bio.