Question 1:

In corn, a triple heterozygote was obtained carrying the mutant alleles s (shrunken), w (white aleurone), and y (waxy endosperm), all paired with their normal wild-type alleles. This triple heterozygote was test-crossed, and the progeny contained: 112 shrunken; 8 fully Wild-type; 2706 shrunken and white; 612 white; 2638 waxy; 625 shrunken and waxy, 116 white and waxy; 6 shrunken, white and waxy.


  • Analyse these data by ordering and labelling the progeny classes, determining recombination frequencies, and then constructing a map of the three loci. Make your reasoning clear. [20 marks]
  • Show the allele arrangement of the triple heterozygote used in the test-cross. [5 marks]
  • Calculate the interference, again making your reasoning clear, and explaining what it means. [10 marks]


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