Best Answer: Crossing-over is another name for recombination or physical exchange of equal pieces of adjacent non-sister chromatids. When crossing-over occurs chromatids break and may be reattached to a different homologous chromosome. This occurs during Meiosis 1 / Prophase 1. Synapsis occurs when homologous chromosomes form tetrads and crossing-over or recombination takes place.
The best time to apply castor oil is at night, preferably couple of hours before bed time. While it is perfectly fine to use them during day time, there is a big advantage in applying them at night as this allows more time to saturate and start the process which aids in growing eyelashes.
Dampen a q-tip with the castor oil (careful not to put too much on it) then apply the q-tip to the eyelash line as if youâre applying your eyeliner. Do this every night before going to sleep. In the morning, wash the castor oil off with warm water thoroughly. Continue to do this for three to four weeks.