In fertilization, a wild-type male microgamete fuses with a female macrogamete to form a zygote.
In fertilization, a sperm first interacts with cumulus cells, somatic cells surrounding an oocyte (Ikawa et al., 2010).
Oocytes were then distributed in fertilization beakers and then fertilized separately by each male at a ratio of 100 spermatozoa/oocyte.
After a 2-hour incubation at 38°C under 5% CO2 in air, spermatozoa were washed twice in fertilization medium and used to fertilize the oocytes.
In vitro−matured oocytes were fertilized with frozen-thawed sperm at a concentration of 2 × 10/mL in fertilization medium (Park et al. 2007).
The experiments, which took years, helped establish the timing of many important steps in fertilization and pregnancy, for example, implantation of the embryo in the uterus.
The adults shed their sperm and eggs, which, when joined in fertilization, form larvae that grow into tiny bottom-dwelling polyps.
Lawmakers said most Westchester lawns would be unaffected by changes in fertilization because soil in this region has sufficient phosphorus material.
Support is growing for federal regulation of new reproductive techniques, combined with approval of the use in medical research of some of the several hundred thousand frozen embryos that are stored in fertilization clinics and likely to be destroyed.
Loeb's work was significant in showing that the initiation of cell division in fertilization was controlled chemically and was in effect separate from the transmission of hereditary traits.
Yet there is evidence that the egg envelopes do play a role in fertilization; i.e., contact with the egg coat elicits the acrosome reaction (described below) in spermatozoa.
