Sexual Reproduction And the Organization of the Nucleus in Certain Mildews
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There is, however, this essential difference, that according to Hermann the mantle fibers are at this stage for the first time extend- ing toward and becoming connected with the chromosomes, while (as we have seen in the ascus) the chromosomes have been continuously attached to the centers through all the preceding stages of nuclear devel- opment. Whether there is longitudinal splitting of the individual fibers, or whether they are merely separated into two groups, I have been 44 SEXUAL REPRODU...CTION IN CERTAIN MILDEWS.
unable to determine. In the case of reduction divisions it would seem probable that the fibers merely separate in two groups. There is no trace of a direct connection between the centers as they separate. There is no evidence of the existence of a diflferentiated central spindle at this stage. As I have suggested (38) for Erysiphe, it is possible that, for a time at least, the presence of the nuclear membrane makes a central spindle unnecessary. As to the permanence of the nuclear membrane and the absence of a central spindle in the early stages of the separation of the centers, the conditions in the ascus are similar to those in the spindle formation in the cleavage of the egg of the trout, whitefish, and many invertebrate animals in which the centers migrate to opposite poles of the nuclei before the nuclear membranes disappear.
What to read after Sexual Reproduction And the Organization of the Nucleus in Certain Mildews?
You can find similar books in the "Read Also" column, or choose other free books by Robert Almer Harper to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
There is, however, this essential difference, that according to Hermann the mantle fibers are at this stage for the first time extend- ing toward and becoming connected with the chromosomes, while (as we have seen in the ascus) the chromosomes have been continuously attached to the centers through all the preceding stages of nuclear devel- opment. Whether there is longitudinal splitting of the individual fibers, or whether they are merely separated into two groups, I have been 44 SEXUAL REPRODU...CTION IN CERTAIN MILDEWS.
unable to determine. In the case of reduction divisions it would seem probable that the fibers merely separate in two groups. There is no trace of a direct connection between the centers as they separate. There is no evidence of the existence of a diflferentiated central spindle at this stage. As I have suggested (38) for Erysiphe, it is possible that, for a time at least, the presence of the nuclear membrane makes a central spindle unnecessary. As to the permanence of the nuclear membrane and the absence of a central spindle in the early stages of the separation of the centers, the conditions in the ascus are similar to those in the spindle formation in the cleavage of the egg of the trout, whitefish, and many invertebrate animals in which the centers migrate to opposite poles of the nuclei before the nuclear membranes disappear.
What to read after Sexual Reproduction And the Organization of the Nucleus in Certain Mildews?
You can find similar books in the "Read Also" column, or choose other free books by Robert Almer Harper to read onlineMoreLess
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