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Sordaria Crossing Over

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Where the growing filaments of the two strains meet, fertilization occurs and zygotes form. Meiosis occurs within fruiting bodies to form haploid ascospores, spores ... – PowerPoint PPT presentation

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Title: Sordaria Crossing Over


1
Sordaria Crossing Over
  • This activity involves observing the results
    of crossing over in a fungus, Sordaria. A cross
    between two haploid strains of Sordaria produces
    spores of different colors.

2
  • Where the growing filaments of the two strains
    meet, fertilization occurs and zygotes form.
    Meiosis occurs within fruiting bodies to form
    haploid ascospores, spores contained in asci
    (special sacs). Then one mitotic division doubles
    the number of ascospores to eight.

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4
  • Four black ascospores in a row next to four tan
    ascospores in a row indicates that crossing over
    has NOT occurred.  Any other arrangement of
    ascospores indicates that crossing over has taken
    place.

5
  • Study the following picture of Sordaria to
    determine if crossing over has occurred in the
    asci.  If the ascospores are arranged 4 dark/4
    light, count the ascus as "No crossing over." If
    the arrangement of ascospores is in any other
    combination, count it as "Crossing over."

6
  • Examples of Sordaria Octads
  • By Fordyce G. Lux IIIProfessor of BiologyLander
    UniversityWe thank you for your excellent work.

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