01:119:115 Lecture Notes - Lecture 16: Endometrium, Ovulation, Motility
18 Mar 2018
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When you have constant progesterone, estradiol is still prevent but it is a negative feedback. Introduction: development, all changes in life cycle, includes embryonic, birth/hatching, etc. Model organisms fig 47. 19 and . 2: species chosen for research -> easily studied. C. ongoing process: sperm = usually flagellated and motile, ovum = larger, non motile, zygote = fertilized egg, single cell. Fertilization: introduction, sperm (n) + egg (n) -> zygote (2n, consequences of fertilization. Sperm contact activates egg, reactions to start development. Egg: plasma membrane, vitelline layer, jelly coat. Egg: plasma membrane, zona pellucida, follicle cells. Steps in fertilization: acrosomal reaction, fast and or slow block to polyspermy, cortical reaction, egg activation, karyogamy, first cleavage -> embryo. Chemotaxis sperm/egg contact -> triggers a. r. (fig 47. 3: acrosome enzymes digest jelly coat, acrosomal process penetrates jelly coat, sperm binds to receptors on egg plasma membrane (p. m. ) Gamete isolation d. fusion of sperm/egg plasma membranes.
