9.3-sexual reproduction

• External fertilisation is when the sperm enters the female's body through the female's external genitalia
• internal fertilisation is when the sperm fuses with the egg cell inside female body
• sharks insert fin into girl vagina
• octopus use smaller army. put sperm inside
• dragonflies mate in flight or on plants
• cockroaches mate on ground
• birds do this by close contact through genital openings
• crossing over process

  1. homologous are replicated
  2. exchange segments
  3. re combinant