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Reproduction

Reproduction. (4). Sexual reproduction in plants. In both animals and flowering plants sex cells are collectively called gametes .

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Reproduction

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  1. Reproduction (4)

  2. Sexual reproduction in plants • In both animals and flowering plants sex cells are collectively called gametes. • Gametes are haploid (n). This means they have one set of chromosomes. When gametes combine they produce a diploid cell (2n). This means it has two sets of chromosomes. One from each parent.

  3. Male parts of a flower • The antherproduces pollen grains which contain the male gamete. Anther Filament

  4. Female parts of a flower • The ovary produces ovuleswhich contain the female gamete. Stigma Carpal Style

  5. Flower structure and function

  6. K/U5- Flower Structure • Label the flower using words from the list. • Which parts of the flower have the function of attracting insects? • Match up the structure and functions with straight lines. • Colour in your flower and underline the label in the same colour! Stamen = + Carpal = +

  7. Fertilisation • The pollen grain then grows a pollen tube down through the stigma and the style to the ovule • During fertilisationthe male gamete (pollen) meets the female gamete (ovule) and they fuse.

  8. The fusionof the nucleus of the male and female gametes is known as fertilisation.

  9. In mammals • In mammals, the male gametes (sperm) which are haploid are produced in the testes and female gametes (eggs)which are also haploid are produced in the ovaries.

  10. The egg is much bigger than the sperm. The sperm can move using its tail.

  11. Male reproductive system

  12. Female reproductive system

  13. Fertilisation • Fertilisation is thefusionof thenucleusof a sperm with thenucleusof an egg.

  14. After fertilisationthe fertilised egg, called a zygote, which is diploid (2n), divides repeatedly by mitosisto form a ball of cells called an embryo. But it is a race!

  15. Only one sperm is required for fertilisation • Fertilisation takes place in the fallopian tube/oviduct

  16. The embryo develops into a baby. At about 9 weeks the embryo is now called a foetus. The mammalian embryo remains within the female parents body for a period of 9 months

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