1 / 11

4 Cell replication

4 Cell replication. ‘Spray-on skin’. ODD FACT It has been estimated that each person replaces, on average, 18 kg of skin cells during a lifetime. Dandruff, skin cells from our scalps, represents just a fraction of the skin cells we must replace.

merv
Download Presentation

4 Cell replication

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. 4Cell replication

  2. ‘Spray-on skin’ ODD FACT It has been estimated that each person replaces, on average, 18 kg of skin cells during a lifetime. Dandruff, skin cells from our scalps, represents just a fraction of the skin cells we must replace. Figure 4.4 ‘Spray-on skin’ or CellSpray, developed by Dr Fiona Wood. Skin cells taken from a patient are cultured and allowed to replicate. A suspension of these cells is sprayed onto burnt areas where they continue to grow and form a new skin.

  3. Nuclear division leads toreproduction of cells • Cells reproduce during the cell cycle. • Cells can reproduce only if the genetic material is replicated. • The duplication of cells involves mitosis and cytokinesis. • The two newly formed cells each have the same kind and amount of genetic material as the parent cell. • Each species has a characteristic chromosome number.

  4. How long is a cell cycle? Figure 4.9 The total time taken for one mitotic cell cycle can vary greatly from organism to organism. Note the checkpoints at which there appears to be self-checking to ensure that mistakes have not occurred during the synthesis of DNA or replication of the cell.

  5. Mitosis occurs in a range of different tissues in different plants and animals. • Some eukaryotes reproduce asexually from a single cell. • Uncontrolled cell replication can lead to cancers.

  6. New liverworts from cells in a cup

More Related