Life And Death Heredity And Evolution in Unicellular Organisms
Life And Death Heredity And Evolution in Unicellular Organisms
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The micronuclei that dissolve and disappear are shown as clear circles. In Vorticella (V) the divisions in the small free indi- vidual (microgamete) are shown at the right; those of the large stalked individual (macrogamete) at the left. Based on diagrams by Maupas, Sexual Diversity in Protozoa 123 Vorticella produces just before the fertilizing process two half nuclei, as Paramecium does, but in the large "female" one is absorbed and disappears, while in the small "male" likewise one is absorb...ed and disappears. The remaining half nucleus of the "male" then passes into the "female, " and unites with its remaining half nucleus. (See the dia- gram of the process in comparison with that in Paramecium, in Figure 35).
Figure 36. Mating in the mould, Mucor, after De Bary. A to E, successive stages. The large black body at E formed by the union of the ends of the two branches, is the zygospore, which later separates off, and produces a new plant.
In Paramecium, it was held by Cull (1907) that there is a less advanced stage of a similar process ; though the two in- dividuals look and act alike, they still are different, since after mating one reproduces more vigorously than the other.
What to read after Life And Death Heredity And Evolution in Unicellular Organisms?
You can find similar books in the "Read Also" column, or choose other free books by H S Herbert Spencer Jennings to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The micronuclei that dissolve and disappear are shown as clear circles. In Vorticella (V) the divisions in the small free indi- vidual (microgamete) are shown at the right; those of the large stalked individual (macrogamete) at the left. Based on diagrams by Maupas, Sexual Diversity in Protozoa 123 Vorticella produces just before the fertilizing process two half nuclei, as Paramecium does, but in the large "female" one is absorbed and disappears, while in the small "male" likewise one is absorb...ed and disappears. The remaining half nucleus of the "male" then passes into the "female, " and unites with its remaining half nucleus. (See the dia- gram of the process in comparison with that in Paramecium, in Figure 35).
Figure 36. Mating in the mould, Mucor, after De Bary. A to E, successive stages. The large black body at E formed by the union of the ends of the two branches, is the zygospore, which later separates off, and produces a new plant.
In Paramecium, it was held by Cull (1907) that there is a less advanced stage of a similar process ; though the two in- dividuals look and act alike, they still are different, since after mating one reproduces more vigorously than the other.
What to read after Life And Death Heredity And Evolution in Unicellular Organisms?
You can find similar books in the "Read Also" column, or choose other free books by H S Herbert Spencer Jennings to read onlineMoreLess
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