LIFE HISTORY OF POLYSTOMELLA (ELPHIDIUM) Featured

Written by 
Published in Zoology
Tuesday, 14 April 2009 17:13
Rate this item
(1 Vote)
Sponsored Links
Life history of Polystomella shows alternation of generations (Sexual method of reproduction will alternate with asexual method of reproduction).
 
Elphidium-Asexual reproduction :
 
In Elphidium microspheric form takes up asexual reproduction by multiple fission. The nuclei break into many Chromatin bits. They become round. They are covered by bits of cytoplasm. Several amoeboid cells are formed. These amoebulae are liberated into water. In the water these Amoebulae will develop shell. The first chamber is called 'Proloculum'.
 
This grows into megalospheric form. It contains only single nucleus. This takes up sexual reproduction.
 
Elphidium Sexual Reproduction :
 
Megalospheric form performs sexual reproduction, it has a single nucleus in its cytoplasm. It undergoes many divisions. The first division is reductional. Then gametes are formed. Each gamete shows two flagella. These are all similar. They are called isogametes. They show 3 to microns length. These isogametes coming from two different parents will unite and a zygote is formed This union is called isogamy. This zygote will give rise to microspheric form. This form shows many nuclei in its cytoplasm. It takes up asexual reproduction.
 
Alternation of Generations :
 
In the lite history of Elphidium the microspheric form will undergo asexual reproduction and produce megalospheric forms. These forms will undergo sexual reproduction and produce microspheric forms. Thus in the life-history micro and megalospheric forms will alternate. This type of alternation of generations is called Metagenesis, because both alternating stages are diploid.


Sponsored Links

Additional Info

Last modified on Thursday, 04 January 2018 20:45
Facebook Google Plus Twitter LinkedIn

RELATED ARTICLES

Advertisement
Advertisement

Featured

CHOLERA: CAUSES, SYMPTOMS, DIAGNOSIS AND TREATMENT

CHOLERA: CAUSES, SYMPTOMS, DIAGNOSIS AND TREATMENT

CHOLERA is a specific infectious disease that affects the lower portion of the intestine and is char...

Useful Sites

  • NCBI

    National Center for Biotechnology Information
  • LTO

    Lab Tests Online® by AACC
  • ASCP

    American Society for Clinical Pathology
  • ASM

    American Society for Microbiology
  • The Medical Library®

    Project of BioScience.pk
Advertisement

Connect With Us

Contact Us

All comments and suggestions about this web site are very welcome and a valuable source of information for us. Thanks!

Tel: +(92) 302 970 8985-6

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Website: https://www.bioscience.pk


This website is certified by Health On the Net Foundation. Click to verify. This site complies with the HONcode standard for trustworthy health information:
verify here.

Our Sponsors

InsightGadgets.comPathLabStudyTheMedicalLibrary.orgThe Physio Club

By using BioScience.pk you agree to our use of cookies to enhance your experience on this website.