BIOL10002 Lecture Notes - Lecture 31: Polarity In Embryogenesis, Blastula, Catenin
Document Summary
Microtubule cytoskeleton is important for organelles movement and cell movement. Sperm does not contribute mitochondria to the embryo. As well as providing the dna, the sperm passes on its centriole: centrioles is important cell division, microtubules for chromosome attachment. Defect is manifest by a high susceptibility to lung infections owing to the paralysed cilia in the respiratory tract that fail to clear debris and bacteria. Male is i(cid:374)fertile (cid:271)e(cid:272)ause the sper(cid:373) (cid:272)a(cid:374)(cid:859)t (cid:373)ove. La(cid:272)k the (cid:858)ar(cid:373)(cid:859) i(cid:374) a(cid:454)o(cid:374)e(cid:373)e the protein to convert atp to movement. The top cells and bottom cells now have different fates: cytoplasmic factors in the oocyte set up the signaling cascades that regulate major events. Splitting longitudinally end up with two normal individuals (smaller sized) Splitting horizontally top cells remain embryonic/bottom cells produce abnormal larva. Therefore upper cells are developmentally divergent from the bottom cells. Sperm would only fertilise in the pigmented region. The sperm centriole initiates the reorganization of microtubules in the vegetal hemisphere.
