Exam 2 study guide - ZOL 320 Study Guide 5 Gametogenesis...

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ZOL 320 Study Guide 5 Gametogenesis and spermatogenesis Reading: Chapter 4 Define, describe or illustrate the following: Gametogenesis Primordial germ cells cytoplasmic localization cytoplasmic determinants germ plasm genital ridge oogonia (oogonium) spermatogonia (spermatogonium) germ cell crescent hypoblast epiblast yolk sac cKit (W spotting gene) Mgf (Steel gene) indifferent gonad spermatozoa (spermatozoon) ova (ovum) meiotic division I meiotic division II sex chromosomes autosomes zygote Prophase I synapsis leptotene zygotene synaptonemal complex tetrad (bivalent) pachytene chiasma (chiasmata) diplotene diakinesis dyad seminiferous tubules type A spermatogonia type B spermatogonia primary spermatocyte secondary spermatocyte spermatid spermiogenesis Sertoli cells acrosome protamines Leydig (interstitial) cells gonadotropin releasing hormone (GNRH) Leutinizing hormone (LH) Follicle stimulating hormone (FSH) inhibin 1. Describe the stages of prophase in Meiosis I in order and tell what happens to the chromosomes in each. 2. Where do germ cells form in mammals and in birds, and where do they go from there? 3. How are spermatogonia and oogonia stem cells? 4. What are genetic problems associated with gene expression in spermatogenesis? 5. Draw and label or otherwise describe a mature spermatozoon.
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6. What is the role of Sertoli cells in spermatogenesis? 7. How does the axoneme move? 8. What is known about the causes of infertility in males? 9. Describe the hormonal axis operating in vertebrates which regulates sperm production. Study Guide 6 Oogenesis ZOL 320 Define, describe or illustrate the following: Oogenesis: egg is nonmoving, large, non uniform cytoplasm, meiotic divisions are not equal and frequently delayed. discontinuous oogenesis: All oogonia become oocytes one early in embryogenesis, no new ones are made (like humans) continuous oogenesis: immortal oogonia (frogs) oogonium (oogonia) vitellogenic phase primary oocyte secondary oocyte diplotene block polar body female pronucleus (germinal vesicle) eutherian mammal isolecithal: little or no yolk sea urchin mesolecithal: a lot of yolk in a gradient frong telolecithal: effects cleavage patterns chick amniote egg jelly coat: extra cellular matrix made of polysaccharides. vitelline membrane (envelope): part of ECM, tough outer layer, thin surround egg. cortical granules: line cytoplasm right under membrane, used for fertilization. follicle (granulose) cells cumulus zona pellucida vitellogenesis: period of yold formation and deposition vitellogenin: yolk precurson molecule made in the liver…it is broken down into phosvitin and lipvitellion in the oocyte. selective amplification progesterone maturation promoting factor (MPF) p 34 (cdc2): adds phosphate to other proteins and activates them…protein kinase
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cyclin B: without this the p34 has no activity. cytostatic factor
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This note was uploaded on 11/15/2011 for the course ZOL 320 taught by Professor Kopachik,w during the Fall '08 term at Michigan State University.

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Exam 2 study guide - ZOL 320 Study Guide 5 Gametogenesis...

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