fungal - Fungal genetics Many fungi (and some other...

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Fungal genetics • Many fungi (and some other species) place all of the products of a single meiosis into a single structure (an ascus ) • This allows for a much more detailed analysis of recombination Many yeast place all of the spores from a single round of meiosis into a single structure (the ascus) This can be a tetrad (four spores) or an octad (eight spores) The spores can either be unordered or ordered. in an ordered tetrad/octad, the position of the spores provides information about the underlying cell divisions Linear octads in bread mold
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Linear ascus allow for centromere mapping • Because of the linear segregation in linear tetrad/octads we can use single markers to map distance from centromere • Upper half of the tetrad/octad correspond to one centromere, bottom half the other. Tetrad Octad 1st vs. 2nd division segregation • If no recombination between the gene and the centromere, the two alleles separate in the 1st division • If there is a recombination between the locus and the centromere, the alleles in a heterozygote separate in the 2nd division
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This note was uploaded on 12/09/2009 for the course ECOL 320 taught by Professor Weinert during the Spring '07 term at University of Arizona- Tucson.

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fungal - Fungal genetics Many fungi (and some other...

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