8 (2).ppt - Beyond Mendel The study of genes is closely connected with technology The light microscope the electron microscope X-ray diffraction and gel

8 (2).ppt - Beyond Mendel The study of genes is closely...

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Beyond Mendel
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The study of genes is closely connected with technology The light microscope, the electron microscope, X-ray diffraction and gel electrophoresis have provided a more complete picture of gene action
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Today we know that genes— Gregor Mendel’s “hereditary factors” —are located on chromosomes.
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New technology has also helped a branch of biology called cytology Cytology is the study of the formation, structure and function of cells
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Around 1900, cytologists began to see parallels between the behavior of chromosomes and the behavior of Mendel’s factors. Using improved microscopy techniques: Walter Fleming - mitosis in 1882 August Weisman – Meiosis in 1887
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In 1902, Walter Sutton , & Theodor Boveri, noted these parallels and developed the chromosome theory of inheritance began to take form
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1. Genes occupy specific loci on chromosomes. 2. Chromosomes undergo segregation during meiosis. 3. Chromosomes undergo independent assortment during meiosis. It states
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Linked genes
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Are located on the same chromosome Are inherited together will not assort independently during meiosis…. they can’t….they are on the same chromosome
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Are coded for by genes that are located on a sex chromosome They can be: x -linked (on the x chromosome) y –linked (on y chromosome)
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