Plant Relations : a First book of Botany
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In our eReader you can find the full English version of the book. Read Plant Relations : a First book of Botany Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Plant Relations : a First book of Botany
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In general they seem to be unable to act as the zoospores in the formation of new filaments, but occasionally one of them forms a filament much smaller than the ordinary one (Fig. 2, E). This indicates that they may be zoospores reduced in size, and unable to act as the larger ones. The important fact, however, is that these smaller swimming cells come together in pairs, each pair fusing into one cell (Fig. 2, C, d, e). The cells thus formed have the power of producing new filaments more or les...s directly.
It is evident that this is a sexual act, that the cell pro- duced by fusion is a sexual spore, that the two cells which fuse are gametes, and that the mother cell which produces them acts as a gametangium. Cases of this kind suggest that the gametes or sex cells have been derived from zoo- spores, and that asexual spores have given rise to sex cells.
THE EVOLUTION OF SEX 15 The appearance of sex cells (gametes) is but one step in the evolution of sex. It represents the attainment of sexuality, but the process becomes much more highly developed.
What to read after Plant Relations : a First book of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Carl A. Schenck Collection (North Carolina State University). Ncrs to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In general they seem to be unable to act as the zoospores in the formation of new filaments, but occasionally one of them forms a filament much smaller than the ordinary one (Fig. 2, E). This indicates that they may be zoospores reduced in size, and unable to act as the larger ones. The important fact, however, is that these smaller swimming cells come together in pairs, each pair fusing into one cell (Fig. 2, C, d, e). The cells thus formed have the power of producing new filaments more or les...s directly.
It is evident that this is a sexual act, that the cell pro- duced by fusion is a sexual spore, that the two cells which fuse are gametes, and that the mother cell which produces them acts as a gametangium. Cases of this kind suggest that the gametes or sex cells have been derived from zoo- spores, and that asexual spores have given rise to sex cells.
THE EVOLUTION OF SEX 15 The appearance of sex cells (gametes) is but one step in the evolution of sex. It represents the attainment of sexuality, but the process becomes much more highly developed.
What to read after Plant Relations : a First book of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Carl A. Schenck Collection (North Carolina State University). Ncrs to read onlineMoreLess
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