alternation of generations in mosses/ferns (haploid/diploid)

Plants!

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
User avatar
Twila
Garter
Garter
Posts: 13
Joined: Fri Apr 17, 2009 1:07 pm
Location: iowa ... in the middle of no where

alternation of generations in mosses/ferns (haploid/diploid)

Post by Twila » Wed Apr 22, 2009 1:28 pm

Im being told that gametophyte;haploid is the largest stage in of alternation of generations in mosses, and ferns its sporophyte; diploid,

Im pretty thoroughly confused.. I thought they were basicly the same plant because they reproduce through spores and they are vascular,

I feel bad because of the fact that next year I'll be going to college to be a floral designer/horticulturist and I want to crossbreed different flowers...
"Courage is not always a roar, but sometimes a quite whisper at the end of the night saying 'I will try again tomorrow'"

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Wed Apr 22, 2009 1:54 pm

every plant has the gametophyte, the haploid stage that gives rise to gametes, and the sporophyte, the diploid stage that gives rise to spores.
In mosses, the actual plant that you see is the gamethophyte, whereas the sporophyte is just the thing that looks somewhat like a small flower, is a parasite on the gamethophyte and is basically an urn full of spores.

In ferns, the gametophyte is reduced a lump of cells called the prothallus, which can either be green and thus autotrophic or saprophytic in the soil. the actual big plant is the sporophyte.

In higher plants (gimnosperms and above) the gametophyte is reduced to just a few cells inside the seed (in the male seed of angiosperms the prothallus is just one cell if i remember correctly).

Does that help?
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

User avatar
Twila
Garter
Garter
Posts: 13
Joined: Fri Apr 17, 2009 1:07 pm
Location: iowa ... in the middle of no where

Re: alternation of generations in mosses/ferns (haploid/diploid)

Post by Twila » Wed Apr 22, 2009 2:21 pm

kind of.... this site crashed on me for a bit there thanks.
"Courage is not always a roar, but sometimes a quite whisper at the end of the night saying 'I will try again tomorrow'"

Post Reply

Who is online

Users browsing this forum: No registered users and 4 guests