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Meiosis

Meiosis . Review:. Homologous chromosomes Gametes Gene Diploid (2n) Haploid (n) Somatic cells Autosomes Sex chromosomes Mitosis. Why is sexual reproduction more beneficial to a species than asexual reproduction – over time?. Asexual Reproduction.

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Meiosis

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  1. Meiosis

  2. Review: • Homologous chromosomes • Gametes • Gene • Diploid (2n) • Haploid (n) • Somatic cells • Autosomes • Sex chromosomes • Mitosis

  3. Why is sexual reproduction more beneficial to a species than asexual reproduction – over time?

  4. Asexual Reproduction

  5. Sexual Reproduction leads to diversity!

  6. How does meiosis result in diversity? Homologous chromosomes trade parts during Prophase I – crossing over.

  7. Homologous chromosomes get shuffled – Independent Assortment

  8. You never know which of the homologous chromosomes will end up in which egg.

  9. Where are gametes made in the human body? Ovary

  10. Meiosis – Reduction Division • Watch this process and think about how meiosis (the formation of gametes) is different from mitosis.

  11. How is a zygote formed?

  12. Meiosis: Males vs. Females • Males: • Meiosis and sperm production begins at puberty • Continuous process that males will always undergo – takes 9 weeks • Females: • Meiosis and egg production begins before birth. Process stops abruptly, and does not begin again until puberty • At puberty, one egg each month resumes meiosis and finishes its development • Process stops when a women reaches menopause (around 50 years of age) • Meiosis of a singe egg could take 50 years to complete!

  13. Skin Cells Egg Cells Comparison of mitosis and meiosis Somatic Cells or Body Cells Gametes or sex cells Diploid Haploid

  14. Meiosis Review

  15. Diploid Vs. Haploid?

  16. Gametes Vs. Somatic Cells

  17. Can you explain this diagram?

  18. Meiosis Foldable Draw and Label: • Diploid cells • Homologous chromosomes • Crossing over • Haploid cells Explain: Are the newly formed haploid cells genetically identical to the parent cell? Explain why or why not.

  19. Meiosis Review • The Meiosis Square Dance • Meiosis I Animation • Meiosis II Animation

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