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.
Prophase I. Prophase I is found in Meiosis I. The chromosomes become visible in Prophase I and synapse to form tetrads. Resulting tetrads contain two pairs of chromosomes; therefore, known as âbivalentsâ. Crossing over is an important process happens in Prophase I which allows the chromosomes to exchange genetic materials and to produce more different recombinants. The crossing over points in chromosomes are called âChiasmataâ.