BRAINCAKEInternal Fertilisation
Fertilisation is the fusion of a haploid male gamete with a haploid female gamete to form a diploid zygote. In internal fertilisation, the gametes fuse inside the body of the female. The male places sperm directly into the female reproductive tract, usually during mating (copulation). Mammals, birds, reptiles and insects all use internal fertilisation.
Internal fertilisation has several advantages:
• the gametes are protected from drying out, so fertilisation does not depend on external water for sperm to swim in. This allowed animals to reproduce on dry land.
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More in Meiosis and Sexual Reproduction
- Gametogenesis in Plants
- Formation of Pollen
- Formation of Plant Egg Cells
- Pollination
- External Fertilisation
- Fertilisation in Humans
- Fertilisation in Plants
- Embryo Development in Mammals
All 28 lessons in Meiosis and Sexual Reproduction · All Edexcel AS-level Biology topics