Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

B2.7 mitosis and meiosis

1,879 views

Published on

Published in: Technology, Education
  • Be the first to comment

B2.7 mitosis and meiosis

  1. 1. Mitosis WALT: To understand how cells divide by a process called mitosis which results in two daughter cells being produced. WILF: ~ State a definition for mitosis and what is produced as a result. (D) ~ Describe how mitosis occurs. (C) ~ Explain when mitosis occurs. (B) ~ Explain the role of mitosis in asexual reproduction. (A/A*) Keywords mitosis diploid chromosomes daughter cells asexual reproduction
  2. 2. In human cells, you will find 46 chromosomes (23 pairs)  Diploid number To make more body cells, these cells must divide, a process called mitosis.
  3. 3. Parent cell Daughter cells
  4. 4. Why? For growth For repair
  5. 5. Mitosis and cancer
  6. 6. Keywords Nucleus Chromosomes Diploid DNA replication Parent cell Daughter cell Questions 1. What is a diploid cell and how many chromosomes does a human diploid cell have? 2. Explain why mitosis must occur. 3. Define asexual reproduction and name examples of when this happens.
  7. 7. Meiosis WALT: To understand how sex cells (gametes) are produced by another type of cell division, meiosis. WILF: ~ State a definition for meiosis and gametes. (D) ~ Describe how meiosis occurs. (C) ~ Explain differences between mitosis and meiosis. (B) ~ Explain the importance of meiosis in relation to variation. (A/A*) Keywords meiosis haploid gametes sexual reproduction variation
  8. 8. Gametes (Sex cells) egg cell haploid cells diploid cell sperm cell zygote
  9. 9. Sexual reproduction requires sex cells, also known as… These cells are different to body cells because… When gametes fuse during fertilisation, they produce a… Keywords Gametes Haploid Zygote
  10. 10. Meiosis To produce gametes, a different type of cell division must happen, meiosis. 1st cell divisionseparates the pair of chromosomes. 2nd cell divisionseparates the copies of each chromosome.
  11. 11. Making gametes-Meiosis Making gametes-Meiosis 1. You start off with a ___________ cell, which contains pairs of _____________. 2. The chromosomes then _____________ (like they do in mitosis). 3. The __________ cell ___________ now happens, the pairs of chromosomes separate. 4. The second cell division then happens. This produces ____ ____________ cells. Each cell gets a copy of one chromosome from each pair. These 4 cells are known as being _________, as they have half the amount of chromosomes. This type of cell division is known as ___________. 1. Keywords Chromosomes Replicate Meiosis Haploid Diploid First 4 Division Daughter Keywords Chromosomes Replicate Meiosis Haploid Diploid First 4 Division Daughter You start off with a ___________ cell, which contains pairs of _____________. 2. The chromosomes then _____________ (like they do in mitosis). 3. The __________ cell ___________ now happens, the pairs of chromosomes separate. 4. The second cell division then happens. This produces ____ ____________ cells. Each cell gets a copy of one chromosome from each pair. These 4 cells are known as being _________, as they have half the amount of chromosomes. This type of cell division is known as ___________.
  12. 12. Mitosis vs. meiosis Mitosis No. of cell divisions? No. of daughter cells formed? Diploid or haploid cells produced? Needed for…? Daughter cells identical? Meiosis Use your notes on mitosis and meiosis to fill in this table of differences between the two processes.
  13. 13. Mitosis Meiosis Mitosis Mitosis No. of cell divisions? No. of daughter cells formed? Diploid or haploid cells produced? Diploid or haploid cells produced? Needed for…? Needed for…? Daughter cells identical? Meiosis No. of cell divisions? No. of daughter cells formed? Meiosis Daughter cells identical? Mitosis Meiosis No. of cell divisions? No. of cell divisions? No. of daughter cells formed? No. of daughter cells formed? Diploid or haploid cells produced? Diploid or haploid cells produced? Needed for…? Needed for…? Daughter cells identical? Daughter cells identical?
  14. 14. Mitosis No. of cell divisions? Meiosis 1 Mitosis No. of cell divisions? Meiosis 1 No. of daughter cells formed? 4 No. of daughter cells formed? 4 Diploid or haploid cells produced? haploid Diploid or haploid cells produced? haploid Needed for…? Producing gametes (sex cells). Needed for…? Producing gametes (sex cells). Daughter cells identical? Yes Mitosis No. of cell divisions? Daughter cells identical? Meiosis 1 Yes Mitosis No. of cell divisions? Meiosis 1 No. of daughter cells formed? 4 No. of daughter cells formed? 4 Diploid or haploid cells produced? haploid Diploid or haploid cells produced? haploid Needed for…? Producing gametes (sex cells). Needed for…? Producing gametes (sex cells). Daughter cells identical? Yes Daughter cells identical? Yes

×