Lecture No. 4 [04.13.07] Brey-1

Lecture No. 4 [04.13.07] Brey-1 - Biology162...

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Biology 162
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Friday, April 13, 2007 By yours truly. . Ah. . It’s Friday the 13 th! Sorry  it took sooo long to  edit this. I’ve been uber  busy lately. . In fact, I’m  pulling an all-nighter  tonight for my paper. And I haven't studied for  the practical yet. . =/  sadness. . O well, head  up! =) nothings really as  bad as it ever seems  anyway! =)
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Monogamy They are hoping that their mate is the most fit. It is advantageous for the female to CHEAT! Example: Mate guarding may be necessary. Advantage: Parental care Polyandry “Promiscuous girl” Example: Queen Bee (she mates with random males. This is advantageous b/c she can  obtain lots of sperm.) While this is occurring, the male will create a copulatory plug. Example: The more times she mates the greater the likelihood she’ll get more  chemical/protection (e.g. spider web) Lek The males are competing. The dominant male (that wins) has the bootay. The female is solitary. He protects the resources. Examples Prairie bird males display for the females. Dominant gorilla mates with females. Bauer bird : young females are very impressionable. They go for the “bling-bling” while the  mature female realizes that what’s important is the dance.
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Gorillas The female fidelity  is high. The male gorilla has small testes . The male gorilla has small penis  (1.25 inches). The chimpanzee The female is promiscuous. The males knows there is competition. Ergo, big penis, more  sperm (when erect, it’s pencil-thick, 3 inches). The greater  length allows deeper penetration. Humans Male penis is thick, 5 inches when erect. Why? Female orgasm =) induces rhythmic contractions at cervix.  It gives the female pleasure. woohoo. This causes an orgasm.  What’s the evolutionary significance of this? This causes a vacuum  and enhanced sperm uptake. [insert female moan]
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Ergo, If female mates with several males,  natural selection favors males producing more  sperm. In primates and mammals (many matings), 
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This note was uploaded on 11/09/2011 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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Lecture No. 4 [04.13.07] Brey-1 - Biology162...

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