WEIT Chap6

First of all, sex is good.

HOW SEX DRIVES EVOLUTION

First of all... sex is good...Pierre.brawand 19 avril 2011 à 22:36 (CEST)

What is sexual selection?

Sexual selection is a natural process that occurs in animals just before mating: it's a selection that increase an individual's chance of getting a mate. There are two forms.

1) Male-male competition (The Law of Battle): It's a struggle between the males for the possession of a female.

why only ONE female... Generally, males fight for more than ONE female... in order to be sure to transfer their alleles in the offspringPierre.brawand 19 avril 2011 à 22:36 (CEST) . Two males of the same species fight out, and the goal is to drive off the other male in order to win access to females.

2) Female choice: This is a choice made by females. They "compare" males to each others and recognize the most beautiful

beautiful is not the right term herePierre.brawand 19 avril 2011 à 22:38 (CEST) and the biggest physical features (like a big tail, bright colors, etc.). The choice is done after that comparison, and many experiences EXPERIMENTSPierre.brawand 19 avril 2011 à 22:38 (CEST) showed that the strongest and most beautiful again not the right term animal were chosen by females.

Why sex?

that's THE key question... and the answer is not so simple...Pierre.brawand 19 avril 2011 à 22:39 (CEST)

What is dimorphism?

dimorphism or sexual dimorphism? Be precise.Pierre.brawand 19 avril 2011 à 22:39 (CEST)

A question of choice?

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