BIOL303 Lecture Notes - Morphogen, Receptor Tyrosine Kinase, Growth Factor
28 Oct 2013
School
Department
Course
Professor
Document Summary
Drosophila eggs are activated as they pass through oviduct, independent of fertilization. Micropyle is single site of sperm entry. The prevention of polyspermy is the physical blockage of only one sperm being able to go in at a time. Syncytium: a single cell or cytoplasmic mass containing several nuclei, formed by fusion of cells or by division of nuclei. Syncytial blastoderm: in insects, the stage of blastoderm preceding the formation of cell membranes around the individual nuclei of the early embryo. Nuclei migrate to cortex to undergo three more cortical divisions. Cellular blastoderm: the stage at which the blastoderm has gone from being a syncytium to a being cellular. The first mononucleate cells after the rapid nuclear cell division to create the syncytium are created at the posterior pole, where the polar granules are tethered. These cells are called pole cells, and they will form the fly"s germ line.
