Rotation is the act of raising the nose of an aircraft (by pulling back slightly on the control yoke or stick) during the take-off roll, so that it leaves the runway. Rotation allows for a precise, positive departure from the runway.
Crenation is the loss of water from an animal cell due to osmosis. Lysis is the rupture of the cell wall due to too much water moving into an animal cell due to osmosis. Both â¦crenation and lysis have drastic effects on the animal cell.
Trisomy 21 occurs due to the nondisjunction of chromosome 21 during meiosis. It can occur during either the formation of ova or spermatozoa, resulting in an ovum or sperm cell with 22 chromosomes, and which lacks a chromosome 21, and another with 24 chromosomes, which has an extra copy of chromosome 21.