1. Sex Cells and Fertilisation Sexual Reproduction

3. Sexual Reproduction (plant) Petals Anther Filament Nectary Sepal Ovule Style Stigma Ovary Stamen }

4. Sexual Reproduction (plant) Pollen Tube

5. Sexual Reproduction (mammal) Nucleus – contains information in chromosomes Cytoplasm – contains food store Head Tail – allows sperm to swim to egg

6. Sexual Reproduction (mammal) Fertilisation is when the two nuclei fuse

9. Sex Cells and Fertilisation Genetics

11. Genetics The number of chromosomes present in an organisms’ cells depends on its species. e.g Human Male 46 Chromosomes

12. Genetics The thread-like chromosomes are made of a chemical substance called DNA. DNA carries coded genetic information. DNA has two strands which form a twisted structure called a helix. Each piece of information is called a gene.

19. Genetics The amino acids are linked together to make a protein. The sequence of amino acids dictates the structure and function of the protein. Amino acid Amino acid Amino acid Amino acid Protein molecule

21. Fertilisation Mini Essay Describe how and where fertilisation occurs in a flowering plant. For Wednesday 15 th December

22. Sex Cells and Fertilisation Gamete Production

24. Gamete Production Chromosome Chromatid Chromatid Centromere Centromere Centromere

26. 4 gametes produced. Gamete Mother cell. 4 double chromosomes. Matching chromosomes pair. Line up across cell Pairs separate. Cell divides. Chromosomes line up. Each cell divides again. Centromeres split Chromatids pulled apart

28. Sperm Mother cell Egg Mother cell Cell ready to divide again Sperm cell Egg cell MEIOSIS Zygote FERTILISATION

29. Sex Cells and Fertilisation Sex Determination

34. Sex Cells and Fertilisation Genes and Alleles