Home | E-mail | Plant files |  Dictionary  | Search 

 
 
 
Gametophyte [ Botany ]

Dictionary of botanic terminology - index of names

     
  Phase of plant life cycles in which the gametes, i.e., egg and sperm, are produced.  
     
The gametophyte is haploid, that is, each cell contains a single complete set of chromosomes, and arises from the germination of a haploid spore. In many lower plants, the gametophyte phase is the dominant plant form;
The alternate phase of the plant life cycle is the sporophyte, the diploid plant form, with each cell containing two complete sets of chromosomes.  The sporophyte develops from the union of two gametes, such as an egg fertilized by a sperm; The sporophyte is the diploid plant form in with each cell containing two complete sets of chromosomes.  The sporophyte develops from the union of two gametes, such as an egg fertilized by a sperm;  in turn, the sporophyte forms spores that develop into gametophytes. The alternation between haploid gametophyte and diploid sporophyte phases, known as alternation of generations, occurs in all multicellular plants. As plants advanced in evolutionary development, the sporophyte became the increasingly dominant plant form and the gametophyte form has been correspondingly reduced. In contrast to mosses, for example, in the advanced angiosperms the male and female gametophytes are reduced to three-celled and seven-celled structures, respectively, found within the reproductive organs of the familiar flowering plant (the sporophyte).
     

 

 

1



 

Old Cactuspedia home | E-mail | Photo gallery | Dictionary | Search 

Please note: this is an obsolete page Try the new Cactuspedia interface