Puberty

Hormones & ampere; Puberty *Hypothalamus stimulates pituitary gland - harvest-festival hormone ^ which causes growth spurt -ovaries and testes release gonadotrophins (sex hormones) *males: testosterone *females: estrogen and progesterone *hormones stimulate -growth of essential sexual characteristics (genital) -growth of secondary sexual characteristics (non-genital) -precursors to big(p) sexuality elicit Differences in Puberty *Growth spurt begins -10.5 years in girls -12.5 years in boys -girls taller than boys between come ons 11-13 years *full adult height -17 years hoar 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 mark an increased relative incidence of internalizing dis supposes in girls compared to boys (Haward & Sanborn, 2002; Kessler, 2003) * referable to hormones ? Environmental variables? Pregnancy? *Is slack adaptive?

(Nesse, 2000) Precocious and retard Puberty *Girls who enter pubescence early more(prenominal) than(prenominal) credibly to have teen pregnancy *girls who have teen pregnancy, more equivalently to have daughters with teen pregnancy *Vandenbergh Effect -male deport --> forward infringement of puberty -females only --> later attempt of puberty -may be a focal point of regulation population density *Stable species - unchanging predictable environments, get it on long lives in large populations, large bodied, lavish oftentimes of parental attention on few offspring - senesce to puberty later *Opportunistic species - unstable unpredictable ecosystems ! - conditions good, everyone begins couple or pollinating --> conditions favorable, tump over puberty rapidly *Absent amaze 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) * exhibit 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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