Inter-sexual selection

• What is inter-sexual selection between?

  The sexes
• Inter-sexual selection

  Strategies males use to select females or females use to select males
• Who is inter-sexual selection the preferred strategy of?

  Females
• Who pointed out females make a greater investment of time and commitment during and after the birth of her offspring?

  Trivers
• What did Trivers point out?

  Females make a greater investment of time and commitment during and after the birth of her offspring
• Why does it pay for the female to be especially selective?

  Consequences of wrong partner more serious
• It is the female preference which determines which features are passed on to offspring
• What is the runaway process?

  Where characteristics are gradually exaggerated over generations
• Who developed the 'Sexy sons hypothesis'?

  Fisher
• What hypothesis did Fisher propose?

  The 'sexy sons hypothesis'
• What is the 'Sexy sons hypothesis' proposed by Fisher?

  The genes we see today are those that enhanced reproductive success - a female who mates with a male who has a certain characteristic will then have sons who inherit this 'sexy' trait; sons more likely to be selected by successive generations
• Females = quality over quantity