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.
The homologous chromosomes may or may not be in the same place in the cell when it is time for meiosis to start. It is imperative that the homologous chromosomes get together prior to the cell dividing in meiosis. The coming together and pairing of homologous chromosomes is referred to as synapsis. Synapsis takes place during prophase I, or the first stage of meiosis.