The gametophyte (gametophyte) in plants The alternation of generations
The life history, produce gamete
And with a single set of chromosomes of plants. Bryophyte
The gametophyte generation plants developed, common for the gametophyte, Sporogonium
Parasitic on it. Fern
The gametophyte said Prothallus
Although, can live independently, but with the evolution of life period is short. Sporogonium
Compared to not dominant.
The gametophyte is composed of plants haploid Spore
Gametophyte Definition Seed plant
The gametophyte is the pollen grains and the embryo sac
And the corresponding female gametophyte ( Male gamete
Pollen: respectively. sperm
(male gamete), embryo sac Egg cell
( Female gamete
One of the pollen grains) Lethal gene
As a typical representative of Melandrium
) consists of only a few cells can't live independently, parasitic on Sporogonium
On. formation gamete
And breeding generations called gamete generation, gamete generation organisms called gametophyte. General Plant gametophytes chromosomes (n).
The evolutionary history of plants is: Thallophyte
Also in devonian
There), Seed plant
); and in this evolutionary process, gametophyte Evolutionary trends
Is to continue to simplify.
In bryophytes, gametophyte Chloroplast
Parasitic on the gametophyte, called Protonema
The fern gametophyte, known as simplified. Prothallus
But still, independent life.
In seed plants, the sporophyte gametophyte dominated, but greatly simplified, only seven remaining cells in angiosperms, which is a Egg cell
The central cell (two. Polar nuclei
Three). Antipodal cells
Two. Help cell
That cannot live independently, parasites in the sporophyte, and this is the opposite of bryophytes.
Gametophyte inheritance gamete
follow Mendel's law of inheritance
Chromosome, free combination of female parent and male parent in gametes.
The development of gametes directly by creatures called haploid
Biological (even if somatic cell
There are many Chromosome set