PHYSCI M140 Lecture Notes - Lecture 13: Twin, Meta-Analysis, Ejaculation
19 Nov 2016
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A (cid:858)vast co(cid:396)pus of data(cid:859) o(cid:374) hu(cid:373)a(cid:374)s a(cid:374)d othe(cid:396) a(cid:374)i(cid:373)als uggest a ve(cid:396)(cid:455) diffe(cid:396)e(cid:374)t h(cid:455)pothesis. Sex differences in sexually dimorphic nucleus of the preoptic area (rat poa: males have a larger nucleus than females, poa linked to controlling male sexual behavior. Western u. s. population of sheep with 8% of rams preferring to mate with other males. Sdn poa (ovine or osdn in rams) is significantly smaller in male oriented rams (mor) than in female-oriented rams (for), has fewer neurons, and expresses less aromatase. Fewer neurons in nucleus and less conversion of testosterone to estrogen to hit receptors. The features of this nucleus therefore correlate with sexual partner preference: subjects attracted to males (females and. Mor) are similar and distinguished from subjects attracted to females (for) Domestic rams display variations in sexual partner preference. 10% male-oriented (mor): males preferred mating with males.
