CELL CYCLE Flashcards
important component of the growth of plant
increasing the number of cells in the plant body
Cell division
In plants, this division of cells occurs in special tissues called
This cell division results in daughter cells that are exactly like the parent cells
meristems
There are two phases of this division:
mitosis (or nuclear division) followed by cytokinesis (or cytoplasmic division).
also enables the plant to replace dead cells or to heal wounds
Mitosis
A large spherical nucleus, with the
nuclear membrane intact, grainlike
chromosomes and one to two
nucleoli. This is the stage of
Interphase
A large, spherical nucleus with a
nucleolus and nuclear membrane
intact and with thickened, more
distinctly ribbonlike chromosomes. The chromosome may look like a dish of spaghetti. This is the stage of
Early Prophase
A cell in which the chromosomes appear as a loose knot in the center of the cell. The nuclear membrane, if still present, is indistinct. The nucleolus may start to fade. This is the stage of
Late Prophase
A cell in which the chromosomes are aligned in the equatorial plane of the cell. This is the stage of
METAPHASE
A cell in which the chromatids are moving to opposite poles of the cell. This is the stage of
ANAPHASE
A cell in which the chromatids, though fairly distinct are close to the opposite poles of the cell. A cell plate may be forming at the middle of the cell. This is the stage of
Telophase
Look for two cells that appear to have finished dividing recently. These are the daughter cells and the stage seen is the stage of
Cytokinesis
defined as the ratio between the number of cells in a population undergoing mitosis to the total number of cells in a population.
Mitotic Index
An elevated _________ indicates more cells are dividing and this usually indicates growth or tissue repair since it involves the division of cells
mitotic index
MITOTIC INDEX equation
(Number of Cells in Mitosis /
Total Number of Cells) x 100
duration of the cell cycle in a typical onion root tip
16 hours
