Please answer the four questions below, then when you've finished close the window by clicking on the X in the top right corner to return to the RLO.

1. In which organ would you expect to find cells dividing only by mitosis?
   

   1.   ?    Testes
   2.   ?    Ovaries
   3.   ?    Intestine

2. What is going on in the S-phase of the cell cycle?

   1.   ?    Separation of chromosomes by the spindle fibres during mitosis
   2.   ?    Synthesis of a complete copy of DNA for each of the daughter cells
   3.   ?    Nothing. The cell has stopped dividing at this point or it cannot divide anymore.

3. How many chromsomes are there from each biological parent in a healthy somatic or body cell?

   1.   ?    46
   2.   ?    23
   3.   ?    92

4. In genetics, what is "crossing over"?

   1.   ?    Death of a cell; moving from living to dead.
      
   2.   ?    Activation of a cell as it moves from interphase to prophase in the cell cycle.
   3.   ?    Mixing of maternal and paternal DNA to form a slightly new chromosome during meiosis I.