2.5B Importance of Cell Differentiation (Edexcel IGCSE Biology)
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Biology Lead
Cell Differentiation & Specialised Cells
- The structural differences between different types of cells enables them to perform specific functions within the organism
- Cell differentiation is an important process by which a cell changes to become specialised
- As an organism develops, cells differentiate to form different types of cells
- Almost all of the cells in a multicellular organism will contain the same genetic information (the same genes or alleles), but depending on what role a particular cell needs to have, only some of the genes in a particular cell are used/expressed to control its development
- When a cell differentiates, it develops a structure and composition of subcellular structures which enables it to carry out a certain function
- For example, to form a nerve cell the cytoplasm and cell membrane of an undifferentiated cell must elongate to form connections over large distances
Diagram showing the possible differentiation of a human cell into two different cell types
Differentiation and development
- As a multicellular organism develops, its cells differentiate to form specialised cells
- In an animal, most cells differentiate at an early stage of development
- As a result, animal cells lose their ability to differentiate early in the life of the organism
- Specific cells in various locations throughout the body of an animal retain the ability to differentiate throughout the life of the animal
- These undifferentiated cells are called adult stem cells and they are mainly involved in replacing and repairing cells (such as blood or skin cells)
- Plants differ from animals in that many types of plant cells retain the ability to fully differentiate throughout the life of a plant, not just in the early stages of development
Specialised cells in animals and plants
- Specialised cells are those which have developed certain characteristics in order to perform particular functions. These differences are controlled by genes in the nucleus
- Cells specialise by undergoing differentiation: this is a process by which cells develop the structure and characteristics needed to be able to carry out their functions
- Some examples of specialised animal and plant cells are shown in the table and images below
Examples of Specialised Cells in Animals Table
Ciliated epithelial cells
A nerve cell
Red blood cells
Sperm cell
Egg cell
Examples of Specialised Cells in Plants Table
Root hair cell
Palisade mesophyll cell
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