In Aspergillus, the genes y (yellow), os (osmotic), c (colonial), leu (leucine-requiring), and a (aconidial) are located on the long arm of chromosome 3. A diploid was made between a haploid wild type and a haploid of genotype y os c leu a. From the green diploid, yellow diploid sectors appeared. When these were sampled and tested, the following was found:
56%were yellow, osmotic, aconidial, and leucine-requiring 40%were yellow, osmotic, colonial, aconidial, and leucine-requiring 4%were yellow, aconidial, and leucine-requiring
(a) What is the origin of the three types of yellow sectors? (Diagram it on chromosomes)
(b) What is the order and relative map distances of the five loci?
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Whenever you have a diploid organism (expecially one that is usually haploid) you will often get expression of only one of the chromosomes at a time. But this can vary from one portion of the organism to another, (or in different organisms in a group). This is a little different than doing a cross and looking at the progeny.
So, let's start with part (b) because it's really the main answer. ...
This job explains diploid organisms. The diagram for linkages are provided.