Your SlideShare is downloading. ×
Meiosis
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Meiosis

644

Published on

Published in: Technology, Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
644
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
18
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide
  • Homologous means the same- in this case the same trait (may be different versions of this trait- brown eye gene vs. blue eyed gene)
  • Transcript

    • 1. Meiosis The beginning of Genetics
    • 2.  
    • 3. Meiosis vs. Mitosis
      • Mitosis is used to make duplicate cells for growth, repair and replacement.
      • Meiosis is used to make sex cells
        • For example: Eggs and Sperm
      • Mitosis ends with the exact number of chromosomes as it began with
      • Meiosis reduces the number in half
        • Meiosis is also referred to “reduction division”
    • 4. Interphase
      • Cell starts out as a DIPLOID cell. Either a SPERMATOCYTE or an OOCYTE
      • Chromosomes replicate.
      • Chromosomes cannot be seen
      Nucleus Cell Membrane
    • 5. Prophase I
      • Nucleus starts to disappear.
      • Sister Chromatids pair up to form chromosomes, which now can be seen.
      • Homologous Chromosomes pair up to form tetrads.
      • Centrioles duplicate and move to the poles
      Centromere
    • 6. What kind of cell is this?
      • Haploid
      • Diploid
      • Homologous
      • None of the above
      1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
    • 7. Metaphase I
      • Spindle Fibers appear.
      • Tetrads line up along the middle of the spindle.
      • Fibers attach to centromere.
      Spindle Fibers
    • 8. Anaphase I
      • Spindle fibers pull the tetrads apart
      • Chromosomes are pulled to the centrioles.
    • 9. Telophase I
      • Spindle Fibers and centrioles disappear.
      • Nucleus reappears around each of the new sets of chromosomes.
      • Cell starts to form a break at the middle and starts to pinch in at the sides.
    • 10. Telophase I (continued)
      • Cell continues to split at the mid-line forming two cells. This cell splitting is called cytokinesis
    • 11. Meiosis II Continues with both cells, but this will only show one
    • 12. Prophase II
      • Chromosomes are already visible
      • Nucleus disappears
      • Centrioles move to the poles
    • 13. Metaphase II
      • Spindle Fibers appear
      • Chromosomes are lined up along middle of cell
    • 14. Anaphase II
      • Chromosomes are pulled apart to the centrioles
    • 15. Telephase II
      • Spindle fibers and centrioles disappear
      • A nucleus appears around each set of chromosomes
      • Cell starts to pinch in at the center
    • 16. Telephase II (Continued )
      • Both cells divide (cytokinesis), leaving 4 new cells
      • Each with half the number of chromosomes the original cell had.
      • Each cell is now HAPLOID, called a gamete.
      • Gametes can a be a sperm or an egg.
    • 17. In what cells does meiosis occur?
      • Skin
      • Hair
      • Reproductive organs
      • All of the above
      25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
    • 18. Which of the following is a gamete?
      • Sperm
      • Egg
      • Sex Cell
      • All of the above
      25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

    ×