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.
Castor oil is the go-to traditional cure for all kinds of skin and hair problems, as well as for a variety of health issues such as joint pains and upset stomach. Castor oil has been used for as long as since the ancient Egytians to induce labour.Castor plants are mostly found in India and Africa.astor oil has a lot of health benefits for the body, and not just for the skin. It helps with joint and muscle pain, relaxing muscle tension, digestion and blood circulation. These qualities make it ideal to be used in massage therapy.