Tuesday, January 28, 2020

Compare and Contrast Mitosis and Meiosis

You will work individually and without the textbook to compare and contrast mitosis and meiosis
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Monday, January 27, 2020

CoronaVirus

Information about the current outbreak of the current out break of the virus will be discussed and what is being done to try and control the spread. 
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Manifestation of Errors in Meiosis





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 Image result for errors during meiosis

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Meiosis

The creation of gametes:

This illustration outlines the stages of meiosis. In interphase, before meiosis begins, the chromosomes are duplicated. Meiosis I then proceeds through several stages. In prophase I, the chromosomes begin to condense and the nuclear envelope fragments. Homologous pairs of chromosomes line up, and chiasmata form between them. Crossing over occurs at the chiasmata. Spindle fibers emerge from the centrosomes. In prometaphase I, homologous chromosomes attach to the spindle microtubules. In metaphase I, homologous chromosomes line up at the metaphase plate. In anaphase I, the spindle microtubules pull the homologous pairs of chromosomes apart. In telophase I and cytokinesis, the sister chromatids arrive at the poles of the cell and begin to decondense. The nuclear envelope begins to form again, and cell division occurs. Meiosis II then proceeds through several stages. In prophase II, the sister chromatids condense and the nuclear envelope fragments. A new spindle begins to form. In prometaphase II, the sister chromatids become attached to the kinetochore. In metaphase II, the sister chromatids line up at the metaphase plate. In anaphase II, the sister chromatids are pulled apart by the shortening spindles. In telophase II and cytokinesis, the nuclear envelope forms again and cell division occurs, resulting in four haploid daughter cells.
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Thursday, January 23, 2020

Finals Schedule, January 22- January 25, 2020


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