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

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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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