in Onion Root
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section of an onion root tip x40. The
root cap is toward the bottom. The apical meristem is above consisting
of more or less square cells with rather large nuclei.
apical meristem x400. Most of the cells
even in this area of active cell division are at interphase. Those with
visible chromosomes are at some stage of mitosis.
x1000. Note the distinct nuclear membranes and nucleoli in three of
these cells. The cell in the upper right shows telophase.
x1000. Note the beginning of string-like chromosomes. Nucleoli are
still present but will disappear later in prophase.
x1000. Note the two-chromatid chromosomes lined up at the metaphase
plane in the centeral region of the two cells shown at metaphase. The
two cells in the lower right are at late telophase with cytokinesis
complete but with nuclei containing chromosomes that are still
x1000. Another cell at metaphase.
Anaphase x1000. One chromatid chromosomes
are just beginning to move toward the poles along the visible spindle
x1000. You can recognize this as telophase because cytokinesis has
started between the two groups of chromosomes.
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