The Elementary Principles of General Biology
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In our eReader you can find the full English version of the book. Read The Elementary Principles of General Biology 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 The Elementary Principles of General Biology
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Even in the " lowest " of the Protista, the generalized condition in which two similar adults conjugate to produce a zygote is very rare. In such a case, the entire organism functions as a gamete. One of the most primitive examples is Bodo lens. In this species, two ONTOGENESIS 143 free-swimming individuals (see fig. 54) come to a temporary resting position with one flagellum touch- ing solid matter. They then sway toward each other, meet, and fuse into one. Their flagella dis- appear, and a th...ick covering or cyst is secreted about the fused mass. After a period of rest, the contained protoplasm fragments into a number of spores, or into individuals like the parents, which escape from the cyst as typical " monads " of a smaller size. Other Bodos show a certain difference in size between individuals of the same culture. Conjugation occurs apparently at random between these dissimilar in- dividuals and between similar ones.
It is perhaps more usual for the fully developed microorganism, instead of fusing directly with another similar individual, to fragment into a number of minute, active, individuals called micro- gametes, which conjugate with one another.
What to read after The Elementary Principles of General Biology?
You can find similar books in the "Read Also" column, or choose other free books by James Francis Abbott to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Even in the " lowest " of the Protista, the generalized condition in which two similar adults conjugate to produce a zygote is very rare. In such a case, the entire organism functions as a gamete. One of the most primitive examples is Bodo lens. In this species, two ONTOGENESIS 143 free-swimming individuals (see fig. 54) come to a temporary resting position with one flagellum touch- ing solid matter. They then sway toward each other, meet, and fuse into one. Their flagella dis- appear, and a th...ick covering or cyst is secreted about the fused mass. After a period of rest, the contained protoplasm fragments into a number of spores, or into individuals like the parents, which escape from the cyst as typical " monads " of a smaller size. Other Bodos show a certain difference in size between individuals of the same culture. Conjugation occurs apparently at random between these dissimilar in- dividuals and between similar ones.
It is perhaps more usual for the fully developed microorganism, instead of fusing directly with another similar individual, to fragment into a number of minute, active, individuals called micro- gametes, which conjugate with one another.
What to read after The Elementary Principles of General Biology?
You can find similar books in the "Read Also" column, or choose other free books by James Francis Abbott to read onlineMoreLess
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