1. English writer of novels and short stories (1874-1965)

2. CONCEPTS OF BIOLOGY Chapter 6 REPRODUCTION AT THE CELLULAR LEVEL

3. CELL REPLICATION A sea urchin begins life as a single cell that (a) divides to form two cells, visible by scanning electron microscopy. After four rounds of cell division, (b) there are 16 cells, as seen in this SEM image. After many rounds of cell division, the individual develops into a complex, multicellular organism, as seen in this (c) mature sea urchin.

4. PROKARYOTE GENOME

5. karyotype of the genome of a human female EUKARYOTE GENOME

6. SOMATIC CELLS VS GAMETES

7. CELL CYCLE

8. (I)PMAT

10. FIGURE 6.7 The cell cycle is controlled at three checkpoints. Integrity of the DNA is assessed at the G 1 checkpoint. Proper chromosome duplication is assessed at the G 2 checkpoint. Attachment of each kinetochore to a spindle fiber is assessed at the M checkpoint.

11. FIGURE 6.8

12. CANCER: FROM A HEALTHY CELL TO A CANCER CELL

13. CONCEPTS OF BIOLOGY Chapter 7 THE CELLULAR BASIS OF INHERITANCE

14. Each of us, like these other large multicellular organisms, begins life as a fertilized egg. After trillions of cell divisions, each of us develops into a complex, multicellular organism.

19. MEIOSIS & CROSSING OVER – a more detailed explanation VIDEO (2:57) MEIOSIS & CROSSING OVER - a simple overview VIDEO (1:48)

20. FIGURE 7.3

22. FIGURE 7.9 The incidence of having a fetus with trisomy 21 increases dramatically with maternal age.

23. FIGURE 7.10 Tortoiseshell cats

24. FIGURE 7.11 cri-du-chat