UNIT 5 REVIEW SHEET

1.  List what happens in each of the following 8 phases: G1,S,G2, M, prophase, metaphase, anaphase, telophase.

2.  Which of the above phases are part of interphase?

3.  Draw and label ( name only) the phases of mitosis.

4.  Define cytokinesis.

5.  What are the two parts of cell division?

6.  Cells that have lost control over their growth rate and division are ______.

7.  Explain two reasons why most cells are small.

8.  Why is DNA copied before cell division occurs?

9.  If an organism has a diploid number of 24 chromosomes,

  1. How many chromosomes will be present in a daughter cell produced by mitosis and cell division?
  2. How many chromosomes will be present in daughter cells produced by meiosis?
  3. How many chromosomes will be present in a sperm cell of this organism?
  4. How many chromosomes will be present in a skin cell of this organism?

10.  Explain how cell division is different between plant and animal cells.

11.  Draw a chromosome as it would look in prophase of mitosis. Label the centromere and sister chromatids.

12.  Draw a chromosome as it looks in telophase of mitosis.

13.  Draw a diagram of crossing over.

14.  What is crossing-over? During which phase of which process (mitosis or meiosis) does it occur?

15.  Explain how the cells produced by mitosis are different from the cells produced by meiosis.

16.  Label the following 9 processes as being made possible by mitosis or meiosis: growth, asexual reproduction, regeneration, spermatogenesis (making sperm), oogenesis (making eggs), production of haploid cells from diploid cells, separating pairs of chromosomes, production of non-identical cells, production of identical cells.

17.  What is the function of spindle fibers?

18.  What is a stem cell?

19.  Define homologous chromosomes.

20.  Define zygote

21.  Define sexual reproduction.

22.  Variation in a population can be accomplished by which type of reproduction – asexual or sexual.

23.  Draw a diagram of oogenesis (egg production). Label the egg and the polar bodies. Also tell whether each cell is diplpoid (2N) or haploid (N).

24.  Draw a diagram of spermatogenesis (sperm production). Label the sperm and tell whether each cell is haploid or diploid.

25.  Explain why the chromosome number must be reduced during meiosis.

26.  What process follows meiosis that makes a cell diploid again?

27.  Define gamete and give two examples.