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.
Jamaican black castor oil has been used for centuries as a natural remedy for a wide range of maladies, including skin problems and aches and pains. The dark nutrient-rich oil is obtained from pressing castor beans. The oil produced is commonly used as a hair treatment to repair damage and also to encourage hair growth.