Biology An Introductory Study for Use in Colleges
Biology An Introductory Study for Use in Colleges
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In our eReader you can find the full English version of the book. Read Biology An Introductory Study for Use in Colleges 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 Biology An Introductory Study for Use in Colleges
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Asexual reproduction is division without cell union. Under this head there are at least four different methods.
A. Division by fission.
B. Division by budding.
C. Division by spore formation.
Each of these three types of reproduction is found among unicellular as well as multicellular organisms.
D. Parthenogenesis, or reproduction by eggs without fer- tilization.
2. Sexual reproduction. Sexual reproduction is division preceded or accompanied by a union of cells, the uniting cells being called g...ametes. According to whether the uniting cells are alike or unlike, we find tw9 types.
A. Conjugation. When the uniting cells are microscopically identical with each other, the process is conjugation. In these cases there are neither eggs nor sperms, and the cell resulting from their union is a zygospore.
Conjugation has apparently for its purpose the reinvigora- tion of the process of cell division, since, after two individuals have united, cell division begins to take place more rapidly. After many generations of simple cell division the process tends to become slower, and conjugation then may occur to 262 DISTRIBUTION OF REPRODUCTIVE METHODS 26S reinvigorate the process.
What to read after Biology An Introductory Study for Use in Colleges?
You can find similar books in the "Read Also" column, or choose other free books by H W Herbert William Conn to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Asexual reproduction is division without cell union. Under this head there are at least four different methods.
A. Division by fission.
B. Division by budding.
C. Division by spore formation.
Each of these three types of reproduction is found among unicellular as well as multicellular organisms.
D. Parthenogenesis, or reproduction by eggs without fer- tilization.
2. Sexual reproduction. Sexual reproduction is division preceded or accompanied by a union of cells, the uniting cells being called g...ametes. According to whether the uniting cells are alike or unlike, we find tw9 types.
A. Conjugation. When the uniting cells are microscopically identical with each other, the process is conjugation. In these cases there are neither eggs nor sperms, and the cell resulting from their union is a zygospore.
Conjugation has apparently for its purpose the reinvigora- tion of the process of cell division, since, after two individuals have united, cell division begins to take place more rapidly. After many generations of simple cell division the process tends to become slower, and conjugation then may occur to 262 DISTRIBUTION OF REPRODUCTIVE METHODS 26S reinvigorate the process.
What to read after Biology An Introductory Study for Use in Colleges?
You can find similar books in the "Read Also" column, or choose other free books by H W Herbert William Conn to read onlineMoreLess
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