A-level Biology OCR [New Spec] - Stem Cells | A-level Biology | OCR, AQA, Edexcel

Stem Cells in a Snap! Unlock the full A-level Biology course at http://bit.ly/2UqYjA3 created by Adam Tildesley, Biology expert at SnapRevise and graduate of Cambridge University. SnapRevise is the UK’s leading A-level and GCSE revision & exam preparation resource offering comprehensive video courses created by A* Oxbridge tutors. Our courses are designed around the OCR, AQA, SNAB, Edexcel B, WJEC, CIE and IAL exam boards, concisely covering all the important concepts required by each specification. In addition to all the content videos, our courses include hundreds of exam question videos, where we show you how to tackle questions and walk you through step by step how to score full marks. Sign up today and together, let’s make A-level Biology a walk in the park! The key points covered of this video include: 1. Stem Cells 2. Differentiated Cells Stem Cells Multicellular organisms start off as a ball of non-specialized cells. They don’t have the specific cell shapes or features we see in specialised cells, like erythrocytes.These are called stem cells. Stem cells are cells that are able to express all of their genes and divide by mitosis. As development goes on cells start to resemble more specialised cells. Differentiated Cells As stem cells divide they become more and more specialised. As they become specialised they start to change the number and types of organelles. The shape might change to become more specialised to their function. Full specialised cells are unable to divide by mitosis. Eventually the cell will become suited to its role in the developed organism. This is the process of cell differentiation. Differentiation is where stem cells become more specialised into different cell types. Summary Cells in multicellular organisms start off unspecialised These are called stem cells As stem cells divide they become more specialised This process is called differentiation