1 / 23

MEIOSIS DAY 2

MEIOSIS DAY 2. Bellwork. Why do kids look similar to, but not identical to their parents?. List 2 ways mitosis is different from meiosis. What is the product of meiosis? What is produced *Be thinking of a compliment for your partner!. Announcements & Purpose. Review meiosis

taber
Download Presentation

MEIOSIS DAY 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. MEIOSIS DAY 2

  2. Bellwork • Why do kids look similar to, but not identical to their parents? List 2 ways mitosis is different from meiosis. What is the product of meiosis? What is produced *Be thinking of a compliment for your partner!

  3. Announcements & Purpose Review meiosis Use book to fill in worksheet Quiz on Meiosis Thursday Friday: science fair walk through.

  4. Closure Review/improve closure from yesterday! Period 3/5 read and added to it.

  5. Each of the nucleus of your cells contains all this: Special cells in your body only have ½ this amount. Where? Why?

  6. Each somatic cell has: 2 copies of chromosome ONE -1 from mom, 1 from dad 2 copies of chromosome TWO -1 from mom, 1 from dad How to create a gamete: Meiosis Or ‘How to create an egg or a sperm’ Make a copy! Long red: mother/chromosome 1 Short red:Mother/chromosome 2 Long blue: father/chromosome 1 Short blue: father/chromosome 2 Each gamete has: 1 MIXED copy of chromosome ONE 1 MIXED copy of chromosome TWO

  7. Meiosis Video • http://www.youtube.com/watch?v=kVMb4Js99tA

  8. Finger Meiosis = 2 (chromatid) chromsomes in each cell Hold up 1 pointer finger= this is chromosome 1 from your dad. • Hold up other pointer finger= this is chromosome 1 from your mom =homologous chromosomes • Have them replicate (hold up middle fingers too) • Recombination (mingle them together) • Meiosis 1: Pull hands apart • Meiosis 2: pull fingers apart = 1 chromatid chromosome in each cell

  9. How to create a gamete: Meiosis Or ‘How to create an egg or a sperm’ Make a copy! Each gamete has: 1 MIXED copy of chromosome ONE 1 MIXED copy of chromosome TWO

  10. Asexual Reproduction… New Organisms are CLONES Aka Mitosis But… if you want something new…  Saccharomyces cerevisiae  Cnemidophorus neomexicanus  Cylindropuntia bigelovii … involves only one parent. It takes several forms, but does not involve meiosis. -Budding -Binary fission -Parthenogenesis

  11. Sexual Reproduction • Two gamete cells, a sperm and an egg, unite to form a zygote, the single cell from which the organism develops • MEIOSIS is how gametes (sperm and eggs) are made.

  12. Gametes Are Haploid • Gametes (sperm/egg) must have half the DNA of a normal cell (1 copy) • If the DNA in the gametes was not halved, when they combined the zygote would have more genetic material than the parents • Meiosis is special cell division to make gametes with half the genetic material of the parents

  13. Gametes have exactly one set of chromosomes, this state is called haploid (1n) • Regular cells (somatic cells) have two sets of chromosomes, this state is called diploid (2n)

  14. Haploid nucleus Fertilization Results In A Diploid Zygote Egg (1n) Haploid nucleus Sperm (1n)

  15. Zygote 2n Zygote 2n From Zygote to Embryo

  16. From Zygote to Embryo Cleavage

  17. From Zygote to Embryo Cleavage = mitosis, but daughter cells don’t split apart

  18. From Zygote to Embryo Cleavage

  19. From Zygote to Embryo Cleavage

  20. Finger Meiosis = 2 (chromatid) chromsomes in each cell Hold up 1 pointer finger= this is chromosome 1 from your dad. • Hold up other pointer finger= this is chromosome 1 from your mom =homologous chromosomes • Have them replicate (hold up middle fingers too) • Recombination (mingle them together) • Meiosis 1: Pull hands apart • Meiosis 2: pull fingers apart = 1 chromatid chromosome in each cell

  21. Crash Course MEIOSIS http://www.youtube.com/watch?v=qCLmR9-YY7o

  22. P. 116-117 Use book to fill in front side of worksheet

  23. Closure Review/improve closure from yesterday! Period 3/5 read and added to it.

More Related