Female gametes in flowering plants develop from a meiotic division of a precursor cell followed by mitotic divisions of one of the haploid cells to yield the gametophyte. This study identifies AGO9, a protein involved in RNA interference, as a factor req
How does a seed from a angiosperm plant, that gets pooped out by an animal elsewhere, become fertilized? Isn't the seed only a male gametephyte? How, then, could it combine with the female? How do non-seed-bearing plants reproduce?
Most plants, like the majority of all eukaryotes, reproduce sexually. During fertilization, the gametes from each parent fuse to give rise to a zygote from which the new organism develops. To prevent genome doubling in every new generation, the DNA content of the gametes has to be reduced thr...
In the ovules of most sexual flowering plants female gametogenesis is initiated from a single surviving gametic cell, the functional megaspore, formed after meiosis of the somatically derived megaspore mother cell (MMC). Because some mutants and certain sexual species exhibit more than one MMC, an...
This "genetic" argument starts from the assumption that genes can influence the relative numbers of male and female offspring produced by an individual carrying the genes. That sex ratio will be favored which maximizes the number of descendants an individual will have and hence the number of gene...
Whereas in animal systems the gamete develops directly from the meiotic product, in flowering plants the spore undergoes a few mitotic divisions to form a distinct haploid structure, called the gametophyte. The most common type of female gametophytes, as represented by Arabidopsis, consists of seven...
Understanding the evolution of sex determination in plants requires identifying the mechanisms underlying the transition from monoecious plants, where male and female flowers coexist, to unisexual individuals found in dioecious species. ... A Boualem,C Troadec,Camps, Celine,... - 《Science》 被引...
The plants that contain both male and female parts in a single flower are called monoecious plants. Some examples of monoecious plants are bananas, squash, and hibiscus.Answer and Explanation: The plants have developed monoecious flowers, which allow cross-pollination in the same...
Some angiosperms have evolved an alternate form of reproduction termed apomixis, which avoids meiosis during gamete formation and leads to the production of embryos without paternal contribution. Therefore, apomixis results in the production of clonal progeny through seed. The molecular nature and ...
Meiosis and unreduced gametes. Sexual flowering plants produce meiotically derived cells that give rise to the male and female haploid gametophytic phase.