BIOM 3040 Study Guide - Final Guide: Theca Of Follicle, Folliculogenesis, Zona Pellucida

• School: University of Guelph
• Department: Biomedical Sciences
• Course: BIOM 3040
• Professor: Robinson

Document Summary

Lecture 3: meiosis and oogenesis: to ensure that the chromosome number is maintained in the species from generation to generation, reduce number of chromosomes by half, restore the normal diploid number during fertilization. Prophase 1: leptotene, zygotene, pachytene, diplotene and diakinesis. Diplotene = sub phase of prophase 1 where crossing over occurs. All primary oocytes arrest in diplotene until puberty. Cohesin = helps to keep sister chromatids together so crossing over can occur. Condensin = imp. for compaction of chromosomes. Some yolk accumulation: used for nutrients, very important in species where there is no implantation (like in chickens, humans just need yolk until implantation and then get nutrients from mom. Cortical granule production: accumulation of enzymes. Accumulation of mrna and rrna: accumulation of maternal rna at this stage to ensure proper development until embryonic genome takes over. Crossing over: o(cid:272)(cid:272)urs at (cid:862)hot spots(cid:863) Membrane bound vesicles that lie just below the egg cell membrane.