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.
3. Castor oil nourishes the scalp and stimulates hair growth. Castor oil has low molecular weight, so it penetrates into the skin easily, and act as a softening oil. It is also non-irritant, making it useful for dry and sensitive scalp. The omega -9 fatty acid in the castor oil keeps the hair well moisturised, and provides nourishment to your scalp and hair roots.