PSL300H1 Lecture Notes - Lecture 10: Arteriole, Flagellum, Puberty
Document Summary
Form gametes, female precursor 1 gamete, male precursor 4 gametes, hp axis to control reproduction. Gametes end up with 23 single chromosomes. Through meiosis: dna replicated once (46 sets of chromosomes, divided twice (46/2 = 23 sets of chromosomes /2 = 23 single chromosomes) Prophase 1 especially important for crossing over: to increase genetic variability, **different from mitosis: produces genetic variation in the offspring. Must be released in pulsatile manner: if not pulsatile no function, high pulse frequency fsh, low pulse frequency lh. Pulse frequencies are changed by neurons synapsing onto gnrh neuron: internal (bodily environment) & environmental stimuli. From the anterior pituitary: luteinizing hormone (lh, follicle-stimulating hormone (fsh) Stimulates endocrine cells produces steroids & other hormones (esp. testosterone) Testosterone (indirectly) stimulates gamete production: stimulates primary & secondary sexual characteristic development, negative feedback to ap & ht (stops lh release) Gnrh neurons (originate in olfactory lobes) fail to migrate into the. Effects: can"t smell property, can"t reproduce.
