Puberty

Hormones & ampere; Puberty *Hypothalamus stimulates pituitary gland - egression hormone ^ which causes growth spurt -ovaries and testes release gonadotrophins (sex hormones) *males: testosterone *females: estrogen and progesterone *hormones stimulate -growth of direct sexual characteristics (genital) -growth of secondary sexual characteristics (non-genital) -precursors to big sexuality grammatical gender Differences in Puberty *Growth spurt begins -10.5 years in girls -12.5 years in boys -girls taller than boys between successions 11-13 years *full adult height -17 years overaged in girls -21 years old in boys *Menarche: first menstrual cycle -typically occurs by age 12-13 -initially may involve anovulatory, irregular cycles *Spermarche: first ejaculation -typically occurs by age 15 -initial period of sterility *Puberty attach an increased relative incidence of internalizing dis supposes in girls compared to boys (Haward & Sanborn, 2002; Kessler, 2003) * callable to h ormones? Environmental variables? Pregnancy? *Is slack adaptive?

(Nesse, 2000) Precocious and slow up Puberty *Girls who enter pubescence early more than than(prenominal) apt(predicate) to have teen pregnancy *girls who have teen pregnancy, more comparablely to have daughters with teen pregnancy *Vandenbergh Effect -male posture --> anterior infringement of puberty -females only --> later intrusion of puberty -may be a focal point of regulation population density *Stable species - unchanging predictable environments, cognise long lives in large populations, large bodied, lavish much(prenominal) of parental attention on few offspring - get along with to puberty later *Opportunistic species - unstable unp! redictable ecosystems - conditions good, everyone begins trade union or pollinating --> conditions favorable, tump over puberty rapidly *Absent overprotect Theory: -girls woebegone by their father behave like females from opportunistic species and reach puberty earlier (Draper, Belsky, & Harpending). -process may be caused by pheromones *Strategies for reproductive success 1) early pubertal development, low investment in offspring 2) later pubertal development, high investment in offspring (Belsky, Steinberg & Draper, 1991) * point in support: -females with absent father reached puberty earlier (Surbey, If you want to get a full essay, order it on our website: OrderEssay.net

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