ANSC 320 Lecture 9: ANSC 320 Lecture 9
Document Summary
Leptotene, zygotene, pachytene, diplotene, dictyate: metaphase i, anaphase i, telophase i. Next step for gametes: prophase ii, metaphase ii, anaphase ii, telophase ii. Oogenesis: one mother cell creates one oocyte: the process whereby oocytes develop and eventually become competent to contribute to formation of a zygote after fertilization. Spermatogenesis: one father cell creates 4 spermatids. Folliculogenesis: the process whereby ovarian follicles develop and eventually become eligible for ovulation. Lh induced oocyte maturation occurs in follicle: prepares the oocyte for fertilization, coincides with estrus in the cow, changes focus on the nucleus and cytoplasm, nuclear maturation. Important to reduce number of maternal copies of chromosomes from 4 to 2: cytoplasmic maturation, redistribution of organelles, cytoskeletal and metabolic alterations, changes in protein synthesis, 6 follicle layers. Tertiary follicle: gonadotrophin surge at middle of menstrual cycle stimulates reentry of oocyte into meiosis as far as metaphase ii.
