Meiosis, animation
Videonummer 11938429
| Meiosis, animation. During meiosis (gamete formation) four daughter nuclei are formed from one parent nucleus after two stages of nuclear division. Meiosis occurs only in the sex cells (gametes). It starts at prophase when chromosomes (red and yellow), which contain two identical chromatids, condense into defined units. At this stage crossing-over can occur between homologous chromosomes. This recombination increases the genetic variation in a population. At metaphase (I) pairs of homologous chromosomes line up along the centre of the cell in preparation for separation and removal to opposite poles during anaphase (I). At telophase (I) new nuclear membranes form around each set of chromosomes, resulting in two cells with half the number of chromosomes. This is followed by metaphase (II) where the chromosomes again line up along the centre of the cell in preparation for separation and removal to opposite poles during anaphase (II). At telophase (II) new nuclear membranes form around each set of chromosomes, resulting in four cells with half the number of chromosomes. The full complement is restored when two gametes fuse during fertilisation. | |
| Lizenzart: | Lizenzpflichtig |
| Credit: | Science Photo Library / Biocosmos / Francis Leroy & Valerie Rouvroy |
| Modell-Rechte: | nicht erforderlich |
| Länge: | 43 Sekunden |
| Seitenverhältnis: | 16:9 |
| Restrictions: | - |
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