3. Two haploid yeast strains are crossed to generate a diploid. One of the strai

Question

3. Two haploid yeast strains are crossed to generate a diploid. One of the strains is wild type while the other strain has a growth defect, producing small colonies. WT X small The resulting diploid strain is phenotypically wild type. The diploid is induced to produce spores by meiosis and the following tetrads result: 4 WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT WT small WT WT WT WT WT WT WT WT Please provide a genetic explanation for why tetrad 8 is different from all of the other tetrads. Use a diagram if necessary. 4 pts

Explanation / Answer

In Yeast , the spores are produced by segregation , meiosis and post meiotic mitosis. If there are only parental types , then it can be interpreted that there is no crossover . The presence of single parental type abundant shows that the segregation of gametes is not proper . That is why here there is abundance of one parent . More over the parental genes that are abundant ( wild type ), must be linked . This leads to improper segregation of alleles . Thus , this leads to 8th tetrad being different from each other .

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