intra-sexual selection

• Intrasexual selection: competition between members of the same sex to access mates. Its about who is strongest or most dominant.
• Male gametes (sperm) – small, mobile and produced in very large numbers.

  No parental certainty

  Competition

  promiscuity
• Female gametes (eggs/ ova) – large, nutrient-rich but produced in much smaller numbers.

  High investment cost

  Parental certainty

  High quality mate (genes) desirable