During prophase I, each of the homologous pairs of chromosomes can be seen as bivalent or as a grouping of two chromosomes said to be sister chromatids. The site at which the crossing over occurs on the sister chromatids is known as the chiasma. Prophase I is the longest phase during the meiosis process and takes up to 90 percent of the total time of cell division.
Castor beans are pressed to extract castor oil which is used for medicinal purposes. Ricin (a toxic substance present in the plant) does not partition into the oil because it is water-soluble, therefore, castor oil does not contain ricin, provided that no cross-contamination occurred during its production.icin (a toxic substance present in the plant) does not partition into the oil because it is water-soluble, therefore, castor oil does not contain ricin, provided that no cross-contamination occurred during its production.
Why? Castor oil, a very pale yellow liquid extracted from the castor seeds of Ricinus Communis, is one of the most useful plant oils. Castor oil comes in different grades and is used as food additives, in cosmetics, in flavorings, as a mold inhibitor and in pharmaceuticals.Castor oil has a long history of medicinal uses both internally and externally, treating conditions ranging from arthritis to genital warts.f youâre thinking of using castor oil to bring back the glory, hereâs how: Since castor oil can be thick, dilute it with lighter oil like sweet almond oil or avocado oil. Apply to scalp, rub it in gently and wrap your hair with a plastic cap or towel.