3: Investigating mitosis in root tips Flashcards
The actively dividing cells in the tip of the root is called a ______
Meristem
In order to see chromosomes in cells, cells must be s______
separated
You can separate cells by breaking down the m______ l______ of pectin
middle lamellae
Name the chemical solution that will breakdown pectin
Hydrochloric acid (HCl)
Name the stain used to see the chromosomes.
Aceteic orcein
What concentration of HCl will be needed and at what temperature?
1 mol dm-3
60 dC
Once the roots are submerged, leave them in for ____ minutes
5 minutes
Take out roots and rinse with water.
What length should roots be cut to?
5 - 10 mm
Place the root tips in ______ ________ for ___ minutes at ___ dC.
Aceteic orcein
5 minutes
60 dC
Take roots out and with a drop of water tease root tip apart. This process is called ________
Maceration
Place cover slip and gently squish tissue in order to put under the __________
microscope
Mitotic index =
total no of cells in scope
How could you estimate the time cells spend in each stage of mitosis?
total no of mitotic cells
Why is it difficult to identify stages in mitosis under a microscope?
Mitosis is a dynamic process,
many cells would be fixed during transition from one stage to another