Biology An Introductory Study for Use in Colleges

Cover Biology An Introductory Study for Use in Colleges
Biology An Introductory Study for Use in Colleges
H W Herbert William Conn
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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.


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