The diagram below shows a genetic engineering process. A donor cell was takan from the muscle cell of a male champion horse (stallion) to create a new offspring Cell from miscie tissue of s male champion horse (stallion} Nucleus removed from muscle cell Nucleus piaced in Ovum of mare. An electrical shock results in the ovum' starting to divide. Ovum without. nicleus Ovum irom female horse (mare) Nucleus ol ovurii is removed and discarded B "Ovura divides normaliy Offepring Embryo develops nomaly Embryo placed in uterus of aduit female horse [Adapted from wASw. bioienreterence, com 4.3 Name the: (a) Genetic engineering process shown in the diagram above. (b) Process that produced ovum B 4.2 Why is the donor cell extracted from a champion horse? 4.3 Explain why only the nucleus of the donor cell is used.

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Tissue renewal

In multicellular organisms, tissue is a level of structure that consists of a group of physically and functionally identical cells and their intercellular substances. Unicellular organisms do not have tissues. Tissues are absent or poorly differentiated even in the simplest multicellular animals, such as sponges. However, more evolved multicellular animals and plants have specialized tissues that may organize and govern an organism's reaction to its surroundings. The word tissue is derived from the Latin word 'weave.' Plants and animals have various kinds of tissue systems that differ in their work and composition according to the different requirements.