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Question: genetics rephrase of last questionso i have diploid white yeast...

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Genetics; (rephrase of last question).

So I have diploid white yeast cells undergoing sporulation (so they form a tetrad?). They have the genotype R1r1R2r2 (R1 is one mating type and R2 is the opposing mating type. However, the recessive r's mean they are mutants that cannot produce adenine so they will turn red. The cell needs both dominant genes in order to turn white otherwise if one cannot produce adenine the cell will be red).

So from the R1r1R2r2 the possible combinations are as follows;

R1R2 (white)

R1r2 (red)

r1R2 (red)

r1r2 (red)

 

So we will have a 3:1 ratio. But if they are undergoing sporulation doesn't that mean that the tetrad will contain one of each of these genotypes? So why wouldn't it be a perfect ratio?? And performing the chi-square test it gives a result that indicates that chance is responsible- yes, but how does this outcome relate to the inheritance of traits (Mendelian law) in this way?

Also to be specific, which Mendelian law? The law of segregation or the law of independent assortment?

 

Many thanks!

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