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ZOO501 FINAL TERM PAST PAPERS MEGA FILES
ZOO501: Developmental Biology Solved Papers
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ZOO501: Developmental Biology
All living things that are made up of many living cells are emerging from a slow-moving, ever-changing process called evolution. Development is the process by which a living cell of many cells emerges, starting from a single cell – a fertilized egg, or zygote, which divides to produce all the cells in the body.
Embryology
The study of animal growth has been called embryology, from that stage of life that exists between fertilization and birth. Every day we change more than a gram of skin cells (old cells are depleted as we go), and our bone marrow supports the development of millions of new red blood cells every minute of our lives.
DEVELOPMENT COMMITMENT:
Before a cell divides too far, it can be said that it is committed, that is, the cell has been instructed to its end. An internal system is activated within a cell that causes it to follow a certain developmental process.
Cell differentiation:
Cell differentiation is the process by which the types of active cells emerge from development. For example, neurons, muscle fibers and hepatocytes (liver cells) are known types of different cells. Different cells usually produce large amounts of the few proteins needed for their specific function and this gives them a characteristic appearance that makes them visible under a bright microscope. The genes that encode these proteins are highly efficient. Often their chromatin formation is very wide open, allowing access to transcribed enzymes, and certain transcription factors bind to regulatory sequence in DNA to activate genetic expression.
CLEAVAGE:
Cleavage is a series of rapid mitotic stages in which a large volume of the zygote cytoplasm is broken down into many smaller cells. These cells are called blastomeres, and at the end of the fragmentation, they usually form a sphere known as the blastula.
GASTRULATION:
The process of cellular reconstruction is called gastrulation, and the embryo is said to be in the gastrula stage. As a result of gastrulation, the embryo contains three layers of bacteria: ectoderm, endoderm, and mesoderm. ZOO501 FINAL TERM PAST PAPERS MEGA FILES
ORGANOGENESIS:
Once these three layers of tissue are formed, the cells work together and reorganize to produce tissues and organs. This process is called organogenesis. Many organs are made up of cells from more than one cell. ZOO501 FINAL TERM PAST PAPERS MEGA FILES
