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1. In Saccharomyces cerevisae a cross involving three linked genes is made (ABCxabc). Among 200 asci,...

1. In Saccharomyces cerevisae a cross involving three linked genes is made (ABCxabc). Among 200 asci, one is found to contain the spores ABC, abc, Abc, and abC. What is unusual about this ascus? what event couold explain this ascus?

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unusual about this ascus: ABC and abc are parental combintions whereas Abc and abC have to be recombinant forms. however, a cross over A and B genes would have resulted in Abc and aBC. this is not the case here. if there is a cross over between genes B and C, the recombinants produced would be ABc and abC. Even this is not the case. if there was a double cross over event, the recombinants would be AbC and aBc. Even this is not the case here. the spores in the question did not match any of the above events. hence, this is unusual.

duplication and unequal crossing over could explain this ascus.

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