Light micrograph of two ciliate protozoans,Paramecium sp.,undergoing conjugation,a type of sexual reproduction. The ciliates possess two different types of nucleus; a small diploid micro- nucleus & a larger polyploid macronucleus. During conjugation the cytoplasm of the two conjugants fuses,the macronuclei disintegrate and the micro- nuclei undergo meiotic division. The haploid products of this division are exchanged & a zygote nucleus is formed in both conjugants. New macro- nuclei are then formed by mitotic division of the genetic material of the new micronuclei. Magnification: x300 at 35mm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Nuridsany, Claude / Perennou, Maria |
Taille de l’image : | 5091 px × 3502 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
|