Meiosis phase two (UEB Uncontracted)
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- Synopsis
- These pages show the four stages of the second phase of meiosis and non-identical gametes as a product of meiosis. There is a locator dot shown on each page, which will be at the top left of the page when the image is the correct way up. Meiosis is cell replication where a cell divides to produce four non-identical gametes, each with only one set of chromosomes instead of the usual two sets found in all other cells.Meiosis - stage five, prophase II. This page shows the start of the second phase of meiosis. The original cell has divided into two non-identical cells. There is a cell to the left and right of the page. The cell to the left has a pair of centrioles in the bottom and a single chromatid in the top of the cell. The cell to the right has a pair of centrioles in the top and a single chromatid in the bottom of the cell. In reality in humans there would be twenty three chromatids in each cell.Meiosis - stage six, metaphase II. This page shows a cell to the left and right. Each has a completed mitotic spindle with a centriole to the top and bottom. The chromatids have attached themselves to the centre of each spindle on the central microtubule by their centromeres in the centre of each cell. For clarity other chromatids are not shown so the microtubule to the left and right of each cell appears empty. In reality there would be many more chromatids and microtubules.Meiosis - stage seven, anaphase II. This page shows the centromeres have separated in each cell to the left and right of the page. The microtubules of the spindle are retracting to the top and bottom. The chromatids have split, and each chromosome of each chromatid are migrating to opposite ends of the spindle to the top and bottom in each cell.Meiosis - stage eight, telophase II. This page shows two cells with centrioles to the top and bottom. There is a single chromosome to the top and bottom centre of each cell. The plasma membrane is pinching in from the left and right and starting to divide the cytoplasm in each cell. Four non-identical gametes produced The cells have divided to form four genetically non-identical cells. Each has only one of the original pair of chromosomes. In reality each gamete would have one set of twenty three chromosomes, only one is shown for clarity.
- Copyright:
- 2020
Book Details
- Book Quality:
- Publisher Quality
- Publisher:
- RNIB Bookshare
- Date of Addition:
- 01/01/20
- Copyrighted By:
- RNIB Bookshare
- Adult content:
- No
- Language:
- English
- Has Image Descriptions:
- No
- Categories:
- Nonfiction, Science
- Grade Levels:
- Year 10 - 4th Form - KS4, Year 11 - 5th Form - KS4
- Submitted By:
- Bookshare Staff
- Usage Restrictions:
- This is a copyrighted book.