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Two yeast strains were mated and sporulated (allowed to carry out meiosis). One strain was a haploid with normal chromosomes and the linked genetic markers ura3 (requires uracil for growth) and arg9 (requires arginine for growth) surrounding their centromeres. The other strain was wild type for the two markers (URA3 and ARG9) but had an inversion in this region of the chromosome as shown here in pink:
During meiosis, several different kinds of crossover events could occur. For each of the following events, give the genotype and
a. | A single crossover outside the inverted region |
b. | A single crossover between URA3 and the centromere |
c. | A double crossover involving the same two chromatids each time, where one crossover occurs between URA3 and the centromere and the other occurs between ARG9 and the centromere |
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