202linksupp - Determining Map Distance Determining Cis or...

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Determining Map Distance Determining Cis or Trans Arrangement in the Heterozygous Parent For cross 1 and cross 2 below, consider the following mating: R-red flowers r-white flowers T-tall plants t-dwarf plants We will look at a mating between a red, tall dihybrid plant and a white, dwarf plant: RrTt X rrtt Same mating for both of the crosses below Cross 1 – From the mating above, the following phenotypic classes of progeny were produced: Class 1: Red, tall 353 Class 2: Red, dwarf 128 Class 3: White, tall 142 Class 4: White, dwarf 377 These genes are linked because we do not get a 1:1:1:1 ratio of phenotypic classes (which is what we expect). Classes 2 and 3 are recombinant offspring because they occur in smaller numbers. Classes 1 and 4 are parental offspring To figure out map distance between the color and height genes: 270 (# of recombinants)/1000 (total # of progeny) = .27 (100) = 27 % recombination or 27 map units is the distance between the two genes
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