Onion Root Tip Mitosis


The micrographs linked below were taken with the Science Club camera.
At 40X, micrograph width = 2 mm; at 100X, micrograph width = 0.8 mm; at 400X, micrograph width = 0.2 mm; at 1000X, micrograph width = 0.08 mm.

The first micrograph in each row was taken using a different dry mount with a different stain than the 2nd micrograph in each row.

 
A random view of a number of onion root tip cells.

 
Onion mitosis cells, including interphase cells, prepared slide, 1000X. Note that interphase nuclei have chromatin, with no visible chromosomes.
Their nucleoli are clearly visible.



 
Onion mitosis cells, including prophase cells (near center), prepared slide, 1000X.
Note that prophase nuclei have visible chromosomes with little/no nucleolus visible.

 
Onion mitosis cells, including a metaphase cell, 1000X.
Note that the chromosomes are aligned near the center of the metaphase cell.

 
Onion mitosis cells, including an anaphase cell, 1000X.
Note that the chromosomes are separated but not at opposite ends of the cell.

 
Onion mitosis cells, including a telophase/cytokinesis cell, 1000X.
Note that the chromosomes are at the opposite end of the cell and cytokinesis is underway - the incomplete cell plate is visible.

 
Onion mitosis cells, including a telophase/cytokinesis cell, 1000X.
Note that the two cells are one-half size and the chromosomes are still distinct.


Below are various views of cells at 400X, showing cells in all stages of the cell cycle.