final section of ocr biology b3 revision

1. Revision Part 4 – final section

2. Cell division – the differences MITOSIS MEIOSIS Diploid cells / 2n Haploid cells / n (1) Produces identical cells Produces different cells Involves 1 cell division 2 cell divisions Makes 2 daughter cells Makes 4 daughter cells

4. ENZYMES DIGESTS EGG MEMBRANE / PENETRATE / GET INSIDE THE EGG RESPIRATION

5. MITOSIS – DIPLOID CELLS (46 CHROMOSOMES) MEIOSIS – HAPLOID CELLS (23 CHROMOSOMES) MITOSIS – IDENTICAL CELLS MEIOSIS – DIFFERENT CELLS MITOSIS – 1 CELL DIVISIONS MEIOSIS – 2 CELL DIVISIONS MITOSIS 2 DAUGHTER CELLS MEIOSIS 4 DAUGHTER CELLS

7. DNA is cut into fragments DNA FRAGMENTS SEPARATED / ELECTRIC CURRENT APPLIED / ELECTROPHORESIS

8. 3 CAT GAG ACT

9. Plant cells and growth

10. Chloroplasts Cell Wall Vacuole Cell Membrane Nucleus Cytoplasm

12. Plant hormones

14. How Does This Plant Know to Send Its Shoots ‘Up’ and Its Roots ‘Down’?

16. Artificial Use of Hormones

19. Auxin is made in the tip or top of plant The tip is covered so it doesn’t receive light Auxin levels are equal on both sides Both sides grow at the same rate

20. (1 mark) (1 mark)

21. (1 mark) (1 mark)

23. The Big Picture

25. Mutations

31. Adult Cloning

33. Cloning cows – embryo transplants

35. How Dolly was made

38. (1 mark)

41. Plants that can do it by themselves?