Please enable JavaScript.
Coggle requires JavaScript to display documents.
B2 - Cell Division (B2.1 - Cell Division (cell cycle (STAGES (ONE (longest…
B2 - Cell Division
B2.1 - Cell Division
chromosomes carry genes that contain instructions for making both new cells and tissues and organs - made up of hundreds or thousands of genes
genes contain info that controls a characteristic or part of one, it is a section of DNA
-
-
-
-
-
in asexual reproduction the cells of the offspring are produced by mitosis from parent cells - identical
cell cycle
-
-
-
in adults there are regions where there is continued growth or regular replacement e.g hair follicles, skin, blood and digestive system lining
STAGES
ONE
-
cells grow bigger, increase mass and carry out normal cell activities
-
also increase numbers of sub cellular structures e.g mitchondria, ribosomes and chloroplasts ready for cell to divide
-
-
-
-
B2.3 - Stem Cells
animals
-
inner cells are called embryonic stem cells - differentiate to form the specialised cells in your body
bone marrow + also tiny amount in blood, brain, muscle and liver - adult stem cells
differentiated cells can divide to replace themselves but some tissues can't do this so stem cells stay in these tissues for years - only needed if cells are injured or affected by disease
can be used to treat paralysed people, people going blind from macular degeneration and diabetic people
-
plants
-
gives us a way of producing large numbers of rare plants reliably and safely saving them from extinction
also allows us to produce large populations of identical plants for research - scientists can change variables and observe effects on genetically identical plants
-
used in agriculture to produce large numbers of crops with special features such as disease resistance