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Lecture 6

Lecture 6 BLUE FONT

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University of Toronto Scarborough
Joyce Parga

Lecture 6 Feb.17.11 BLUE FONT SLIDE REPRODUCTION: Mating Success: # of copulations achieved Reproductive Success: #of viable (living) offspring produced SLIDE REPRODUCTION 2: Mating success is not necessarily equal to reproductive success SLIDE SEX DIFFERENCES: Females are limited by food availability Males are limited by access to fertile females SLIDE SEX DIFFERENCES2: Females undergo gestation, lactation, infant care Males often perform little to no infant care Males can have many more babies across their lifetime than can the average male SLIDE SEX DIFFERENCES 3: Some males will have many offspring, others will have none (there can be high male reproductive skew) Certain males have lots of offspring, while some have none The variability from one male to another can be huge amongst males with reproductive success SLIDE REPRODUCTIVE SENESCENCE: Senescence: means aging, your fertility is liking to decline in old age Males: decreased sperm counts over time Females: eggs age; decreased fertility rates. Decreased survival of infants born to aged mothers SLIDE REPRODUCTIVE SENESCENCE 2: Menopause: permanent cessation of menstrual cycles
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