ANA SAYFA


ALGAE-MOSS AND FERN LIFE CYCLE
 
 
 
*Algae life cycle:
 
 
 
→Gametophyte undergoes mitosis and thus, gametes form.
 
→Some of the gametes are female (egg) and some of them are male (sperm).
 
→The female and male gametes fuse and thus, zygote forms.
 
 
→Then, the zygote undergoes meiosis and four haploid spores form.
 
→Each of the spores develop by mitosis and thus, gametophytes form.
 
 
 
 
*Moss life cycle:
 
 
 
 
Male gametophyte undergoes mitosis and thus, male gametes (sperm) form.
 
Female gametophyte undergoes mitosis and thus, female gametes (egg) form.
 
 
→At the tip of the female gametophyte: the male and female gametes fuse and zygote forms.
 
→The zygote develops by mitosis and thus, sporophyte forms.
 
 
→The sporophyte undergoes meiosis and four haploid spores form.
 
→Each of the spores develop by mitosis and thus, gametophytes form.
 
 
 
 
*Fern life cycle:
 
 
 
→Sporophyte undergoes meiosis and thus, four haploid spores form.
 
→Each of the spores develop by mitosis and thus, gametophytes (prothallus) form.
 
 
→The prothallus have both male (antheridium) and female (archegonium) organs.
 
 
Antheridium undergoes mitosis and thus, male gametes (sperm) form.
 
Archegonium undergoes mitosis and thus, female gametes (egg) form.
 
 
→The male and female gametes fuse and zygote forms.
 
→The zygote develops by mitosis and thus, sporophyte forms.

 

 
 
 
 
 
 
 
###########################################################################################

 


 www.biyodoc.com     SİTENİN TÜM HAKLARI SAKLIDIR.

Bu websitesi webservis hosting paneli tarafindan olusturulmustur

web stats