When the non-sister chromatids intertwine, segments of chromatids with similar sequence may break apart and be exchanged in a process known as genetic recombination or crossing-over.
Studying the neuroscience of film is based on the hypothesis that some films, or film segments, lead viewers through a similar sequence of perceptual, emotional and cognitive states.
Almost all animals undergo a similar sequence of events during embryogenesis and have, at least at this developmental stage, the three germ layers and undergo gastrulation.