HMB200H1 Lecture Notes - Ovulation, Delayed Puberty, Estrous Cycle

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Published on 15 Aug 2012
School
UTSG
Department
Human Biology
Course
HMB200H1
Professor
HMB200H1S; March. 09, 2012
Review Session #7 Sex Hormones & Bhvr
Biology of Reproduction
Eggs are more valuable than sperm
Anisogomy: dif in size of gametes, smaller male
Female investment high than males
o Includes eggs, cycling, hormones, gestation, infant care
o Since harder to male eggs than sperm females invest more in
gametes
o Females want quality
o Males want quantity
Mate selection related to survival
o Includes foor & protection resources, viability of offspring
Males & females have dif priorities
o Females invest more so they are the important sex in choosing a
mate based on male dominance & how he will ccontribute good
genes to offspring
o After ovulation, females still have higher investment because
take care of children’s growth & gestation and train children
Put more into child growth
Human Reproductive Strategies
Few offspring (low quantity), highest survival rate (high quality)
Higher investment in each offspring:
o Long gestation, long period of dependence, education
o Investment determines how we feeling about our offspring
Delayed puberty, reproduction, birth control
o All of society is increasing investment & decreasing reproduction
rates further delays
Parent investment, pair bonding
Steroid Hormones
Human Sexual Bhvr
Less dependent on hormones & on pheromones
o Mating throughout cycle, all seasons, throughout life, isn’t solely
based on estrus
Many animals have mating seasons
o We are still effected by pheromones but affected less than
animals due to regression of our olfactory system
More diversity in bhvr
o Ex. positions, partnership patterns
o Mate throughout year since resources always available (ex. food,
water)
Studies of sexual experience & bhvrs (Kinsey, Masters, Johnson)
Sex helps maintain pair bonds for long-term parenting
o Maintained sexual bhvr keep parents together better survival
& investment of children support high demand of investments
required by children
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Document Summary

Sex helps maintain pair bonds for long-term parenting: maintained sexual bhvr keep parents together better survival. & investment of children support high demand of investments required by children. Review session #7 sex hormones & bhvr. Anisogomy: dif in size of gametes, smaller male. Since harder to male eggs than sperm females invest more in gametes. Includes foor & protection resources, viability of offspring. Few offspring (low quantity), highest survival rate (high quality) Investment determines how we feeling about our offspring. Delayed puberty, reproduction, birth control: all of society is increasing investment & decreasing reproduction rates further delays. Less dependent on hormones & on pheromones: mating throughout cycle, all seasons, throughout life, isn"t solely based on estrus. Many animals have mating seasons: we are still effected by pheromones but affected less than animals due to regression of our olfactory system. More diversity in bhvr: ex. positions, partnership patterns, mate throughout year since resources always available (ex. food, water)

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