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.
It also makes the hair more manageable and controls the oily scalp. The hair treatments recipes are using the castor oil for centuries. The seeds of castor plant are very beneficial as it helps in hair growth, preventing dry hair and dandruff problems. There are many commercial castor oil hair treatments available in the market along with pure castor oil.