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.
Seriously I was in shock. I tried a couple of products with moderate results however all seemed to plaetu after a time and then stopped working. After a lot of research I purchase -Sunny Isle Extra Black Jamaican Castor Oil- I noted that the extra black was the stronger and truly I had no time to waste on any trial. This to the best of my knowledge is not available in Australia so found a Ebay Store in the U.K. and had them send it.