Dividing pollen cell,SEM

Bildnummer 11708533
Dividing pollen cell,SEM
Dividing pollen cell. Coloured scanning electron micrograph of a section through a pollen mother cell from a spiderwort (Tradescantia reflexa) flower,during the metaphase (I) stage of meiosis (gamete formation) - showing: chromosomes (yellow),spindle fibres (green),cytoplasm (violet). During meiosis four daughter nuclei are formed from one parent nucleus after two stages of nuclear division. Meiosis occurs only in the sex cells (gametes) of the testes and ovaries. At metaphase (I) pairs of homologous chromosomes line up along the centre of the cell ready to be separated during anaphase (I). Separation results in two cells with half the usual number of chromosomes. The full complement is restored when two gametes fuse during
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / PROFESSOR T. NAGURO
Bildgröße: 3584 px × 2976 px
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