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.
Castor oil is a rich moisturizer that can work to get rid of wrinkles under your eyes while keeping the skin soft and supple. To get the benefits of castor oil all night long, simply dip your pointer finger in a dish of castor oil and apply one swipe of the oil under your eye from your nose to your temple.