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Ch.8- Cellular basis of Reproduction and Inheritance

Ch.8- Cellular basis of Reproduction and Inheritance. We all started out as one cell, how did we become more? Cell division from the original cell Is this type of division sexual or asexual? Asexual, because each new cell is identical to the original.

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Ch.8- Cellular basis of Reproduction and Inheritance

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  1. Ch.8- Cellular basis of Reproduction and Inheritance

  2. We all started out as one cell, how did we become more? • Cell division from the original cell • Is this type of division sexual or asexual? • Asexual, because each new cell is identical to the original

  3. When a Seastar grows back an arm what type of division does it require? • Asexual • What type of reproduction is required to produce Sea star sperm or eggs? • Sexual - the sperm or eggs are not identical to the original cell

  4. This is a picture of the stages of development of a Sea Star embryo

  5. What type of reproduction is this ameba doing? • Asexual - both cells are identical and will lead to 2 new ameba • What do you think “like begets like” means? • It means people make more people and sea stars make more sea stars, people can’t make sea stars

  6. How do people reproduce more people? • Through sexual reproduction • What is the benefit to reproducing sexually over asexually? • Variety - sexual reproduction does not produce clones (exact duplicates) of the parents

  7. What type of organism is pictured on the right? • Prokaryote-Bacteria • What type of reproduction is this? • Asexual-binary fission

  8. What are the spaghetti like things in the cell? • Chromosomes • What has to happen to them before the cell can divide? • It must be duplicated

  9. How are genes carried in a cell? • On a chromosome • What are chromosomes made of? • Protein and DNA called chromatin • When the chromosome’s DNA is duplicated the chromosome is then made up of two ______ ________ • Sister Chromatids

  10. What is the longest stage of the cell cycle? • Interphase • When is the DNA replicated? • Interphase • Mitosis means the splitting of the nucleus, what does cytokinesis mean? • The division of the cytoplasm

  11. Mitosis has 4 stages what are they? • Prophase, metaphase,anaphase and telophase (PMAT) • What is happening during these stages? • The sister chromatids are lining up in the middle of the cell and separating • When did the sister chromatids get made? • Interphase (S phase)

  12. What is happening during the three stages of interpase? • G1 = gap1 supplies are increased • S = DNA copied creating two sister chromatids • G2 = proteins synthesis for mitosis

  13. At what stage of mitosis are the chromosomes first visible? • Prophase • What stage of the cell cycle is the longest? • Interphase

  14. What phase is shown on the right? • Metaphase

  15. Cleavage • What does cleavage mean? • Separation • What is happening when a cleavage furrow forms? • The cell is separating into two. • What type of cells form cleavage furrows during cytokinesis? • Animal

  16. What types of cells form cell plates during cytokinesis? • Plant

  17. What do you notice about these cells growth when some cells are taken away? • They never grow on top of each other, they stop dividing when the dish has one layer.

  18. What happens when those cells become cancerous? • They don’t stop growing and create a tumor

  19. What is the purpose of the checkpoints in the cell cycle? • They are like built-in brakes to keep the cell from reproducing when it shouldn’t • What types of chemicals can switch the G1 checkpoint on? • Growth hormones

  20. What type of process is it when a hormone signals the cell to do something? • Signal transduction • What happens if a cell does not get growth factor? • It will probably stay in interphase • How the cell cycle works

  21. What causes cancer cells to grow out of control? • Their checkpoints are not working • What is the difference between a malignant tumor and a benign tumor? • Malignant tumors continue to divide and pieces can break off and spread to other parts of the body. Benign tumors usually stop growing on their own and do not spread

  22. Cancer animations • More animations • What is the difference between a carcinoma and a sarcoma? • Carcinoma is a cancer of the coverings of the body like skin cancer, sarcoma is cancer of the tissues like bone and muscle

  23. What is the difference between these two mamograms? • The bottom picture shows a tumor

  24. Review • What are the purposes of mitosis? • Growth as seen in the root tip of a plant • Repair • Asexual reproduction as seen with the budding hydra

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