theres a connection between
prevalence of diseases to attractiveness of mate
Gangestad & Buss
evidence that cultures
with higher rates of
partners more than
people in cultures with
low disease in
size gives you an
advantage in males, that
means they need to
compete so what not
occurs all the time?
sexual reproduction is
some organisms change sex with age.
if to be successful as a male you need to be big (e.g., territoriality) wh
L16: The Lek Paradox &
The Dark Side
How can genetic variation persist in populations
under strong sexual selection?
If female choice is persistent, then it should erode
genetic variation in male traits very rapidly.
Benefits to mate choice would decli
Abnormal 2 - 5%
25 - 96 %
low or moderate sperm
not in competition with other
males so doesn't need to have big
testes size; enough to fertilize
Whats in a. Face?
The most refined beauty may serve as a charm
for the female and for no other purpose
- Charles Darwin
"Mr. Winwood Reade," stated Darwin, "who has had ample opportunities
for observation, not only with the negroes of the West Coast of Af
The Funk in the Spunk
Human semen is made up of sperm ( 2-4%) and the secretions of several glands.
Because these are added sequentially and not completely mixed, the ejaculate varies
temporally in composition.
1. 5% from Cowper (bulbourethral) and Littre