in (Wood"s Hole, Mass.) .
Written in English
From Biological bulletin, 67.
|Other titles||Biological bulletin.|
|The Physical Object|
|Number of Pages||114|
Observations on the fertilization reaction in the eggs of some polychaetes and an ascidian, with special reference to the cortical changes. Pubbl. Staz. zool. Napoli, Vol. 25, pp. –Cited by: Sabellaria vulgaris larvae were present in the bay only from mid-April through October. July () and August () hour plankton studies showed larvae present in the water column at virtually all times of the day and by: Maldanid polychaetes show a range of reproductive mechanisms, though previous studies of reproduction have hitherto been restricted to larger species with external fertilization. Fertilization and Development. For fertilization to occur, sperm cells must be released in the vagina during the period that the egg cell is alive. The sperm cells move through the uterus into the fallopian tube, where one sperm cell may fertilize the egg cell. The fertilization brings together 23 chromosomes from the male and 23 chromosomes from the female, resulting in the formation of a fertilized egg cell .
As stated by Wilson  contrary to previous observations (e.g. Faure- Fremiet ), Sabellaria alveolata belongs to this latter category, for, whereas in most cases eggs undergo maturation immediately after shedding, some batches contain vari- ous amounts of eggs remaining in the ger- minal vesicle stage until cytolysis but readi- ly by: Fertilization - Fertilization - Biochemical analysis of fertilization: Many of the early studies on biochemical changes occurring during fertilization were concerned with the respiratory metabolism of the egg. The results, however, were deceiving; the sea urchin egg, for example, showed an increased rate of oxygen consumption as an immediate response to either fertilization or parthenogenetic. Efficient reproduction requires coordination between these two phases of oocyte differentiation. The ovaries of Cirratulus cirratus (O. F. Müller) occur 2/segment throughout the fertile region of the body; 5 main stages of oocyte differentiation can be recognised on them: stem cells, oogonia, premeiotic oocytes, early oocytes and terminal oocytes. A quantitative study of the composition of the ovary throughout the reproductive cycle shows that the ovary Cited by: Observations on reproduction, prematuration, and fertilization in Sabellaria vulgaris, WHITAKER, D. M. The effect of very dilute ethyl alcohol upon the rate of cell division, WITSCHI, EMIL. On determinative cleavage and yolk formation in the harpactid copepod Tisbe furcata (Baird), YOCOM, HARRY B. Observations on.
Fertilization, union of a paternal sperm nucleus with a maternal egg nucleus to form the primary nucleus of an embryo. In higher organisms the essence of fertilization is the fusion of the hereditary material of two different sex cells. Learn about the process of fertilization in this article. Purchase Fertilization - 1st Edition. Print Book & E-Book. ISBN , Book Edition: 1. The concept of a “sexual reproduction cycle (SRC)” was first proposed by Bai and Xu () to describe the integration of meiosis, sex differentiation, and fertilization. This review discusses the evolutionary and scientific implications of considering these three events as part of a single process. Viewed in this way, the SRC is revealed to be a mechanism for efficiently increasing Cited by: R eproduction seems so obvious to us now. Even if we don’t know the details, we know about the birds and the bees. For humans and an overwhelming number of other species, both female and male contribute stuff that, together, transmogrifies into babies. These days we take our understanding of the baby-making process so much for granted that it’s amusing to look back at the .