6. How Sex Drives Evolution
- Explain apparently dysfunctional adaptations
- Peacock’s tail
- Bower bird nest building
- Bright colouring
- Sexual dimporhism
- Predicts which sex has to compete to mate
Usually, but not always the male- “This correlation is another triumph for evolutionary theory, for it is predicted only by the idea of sexual selection and not by any creationist alternative.”
- Predicts which sex has to compete to mate
- Aim is reproduction not survival
- Natural selection produces traits that attract mates
Female preferences are strengthened because those preferences are strengthened by successful reproduction
- Natural selection produces traits that attract mates
- It is not yet understood why sex evolved
Each partner only contributes 50% of genes.- Two sexes is best
- Males gametes are smaller than female gametes
Lots of sperm, few eggs - Sperm is cheap, eggs are not
- Females are, therefore, fussy
oddrops 
[…] The variety of life is explained by the Theory of Evolution; the evidence for which is overwhelming. […]