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Unformatted text preview: Case B Case C Case D spore pair 1 black black black black spore pair 2 black fawn black abort spore pair 3 fawn fawn abort fawn spore pair 4 fawn fawn abort fawn b. What does this result suggest? Explain. When large numbers of unordered tetrads were screened under the microscope, some rare ones that contained black spores were found. Four cases are shown here: ( Note: Ascospores with extra genetic material sur-vive, but those with less than a haploid genome abort.) c. Propose reasonable genetic explanations for each of these four rare cases. d. Do you think the mutations in the two original mutant strains were in one single gene? Explain. 44200_15_p481-520 3/12/04 1:07 PM Page 520...
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- Spring '08