Two units (equivalent to two years or four semesters) of laboratory science are required (three units are strongly recommended), providing fundamental knowledge in two of the following disciplines: 1  Biology. 2  Chemistry. 3  Physics.
Slave forts were established all along the coast of West Africa, to house captured Africans in holding pens (barracoons) awaiting transport. They were equipped with up to a hundred guns and cannons to defend European interests on the coast, by keeping competitors at bay. There were approximately 80 castles dotted along the slave-trading coast.
Barr Body Definition. A Barr body can be defined as a small dark stained mass of X chromosome, which is inactive and are found only in the female cells. It is present in the nuclei of all cells except the germ cells. It is also called as sex chromatin as it indicates the presence of sex hormone.