These are the brain, heart, kidneys, liver, and lungs. The human brain is the body's control center, receiving and sending signals to other organs through the nervous system and through secreted hormones.
For the beetle genus, see Coprini. 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.
But I think most cytogeneticists would say the biggest contrasts occur in Prophase I. This is where all the special stuff happens in meiosis. It's actually further divided into 5 different stages, which does not occur in prophase II or the mitotic prophase (meiosis II is very similar mechanistically and conceptually to mitosis). Among the various special characteristics of Prophase I you have: