What is mitosis? The way cells divide to produce more body cells.

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Presentation transcript:

What is mitosis? The way cells divide to produce more body cells.

Match the following: A B E ____ 1. interphase ____ 2. prophase ____ 3. metaphase ____ 4. anaphase ____ 5. telophase B D C C D A E

1. Describe the main results of meiosis Four haploid cells genetically different from each other and from parent cell.

2. What are the principle differences between mitosis and meiosis? Mitosis makes body (somatic) cells; meiosis makes gametes (sperm, egg). Mitosis makes 2 cells, meiosis 4. Daughter cells from mitosis genetically identical to parent cells; cells from meiosis different. Mitosis makes diploid (2N) cells, meiosis haploid (N)

3. What do the terms diploid and haploid mean? Diploid = 2 sets of chromosomes. Haploid = 1 set of chromosomes.

Human body cells have 23 pairs of homologous chromosomes, or a total of 46.

Homologous chromosomes exchange sections of DNA. 4. What is crossing over? tetrad Homologous chromosomes exchange sections of DNA. Chromatid

5. In human cells, 2N = 46. How many chromosomes would you expect to find in a sperm cell? Egg cell? White blood cell? Explain. 23 46

Connecting Concepts. In asexual reproduction, mitosis occurs, but not meiosis. Which type of reproduction – sexual or asexual – results in offspring with greater genetic variability? Explain your answer. Sexual, because offspring get genes from 2 parents. In asexual reproduction offspring are genetically identical to parents.

Meiosis video http://www.youtube.com/watch?v=D1_-mQS_FZ0