CONJUGATION IN VORTICELLA

CONJUGATION IN VORTICELLA:
conjugation:-The temporary pairing of two individuals of different mating types for the purpose of exchange of nuclear material is called conjugation.
1.Unfavourable conditions induce conju gation in vorticella
2.Before conjugation Vorticella undergoes longitudinal binaryfission
3. Longitudinal binaryfission in vorticella results in two unequal individuals
4.The larger one is called macroconjugant ,the smaller one is called microconjugant
5.Macroconjugant is stationary where as microconjugant is motile
6.Microconjugant fuses with the macroconjugant of different mating type
7.The macronuclei of macroconjugant and microconjugant disintegrate
8.The micronucleus of macroconjugant undergoes meosis(meosis-I and meosis-II) and is divided into four nuclei
9. The micronucleus of microconjugant undergoes meosis(meosis-I and meosis-II) ,one mitosis divided and divided into eight nuclei
10.Among the four nuclei of the macroconjugant three are disappeared
11. Among the eight nuclei of the microconjugant seven are disappeared
12.The remaining nucleus of each conjugant divides into two unequal nuclei
13.The smaller nucleus is malepronucleus and larger is femalepronucleus
14.The malepronucleus of the microconjugant enters into the macroconjugant and fuses with the female pronucleus of the macroconjugant
15.The cytoplasm of microconjugant and macroconjugant are also unified along with the pronuclei,this is called amphimixis
16.The nucleus that is formed due to the amphimixis is called synkaryon
17.The macroconjugant along with synkaryon is called zygote
18.The synkaryon of the zygote undergoes three series of successive mitotic divisions to form eight nuclei
19.Of the eight nuclei seven become macro nuclei and one become micronuclei
20.The zygote with seven maro and one micro nuclei undergoes a series of three successive post conjugationfissions to form seven daughter vorticellae.