The yest genes x and y are syntenic but it is not known whether they are linked. You mate an α mating type yeast with the genotype x+y- to an a mating type yeast with the genotype x-y+ to create an α/a diploid. You allow 50 diploid cells to sporulate and produe asci and then examine the asci. You find that 40 are PD (parental ditype), 8 are TT (tetratype), and 2 are NPD (nonparental ditype).

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Part A

 

 

Part B

 

Part C

Which of the following best describes recombination during a meiosis that results in formation of a NPD ascus?

 

 

asked Nov 22, 2012 in Genetics by GeneX ~Top Expert~ (7,947 points)
    

1 Answer

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Part A

The results support linkage of x and y and indicate that they are 20 cM apart.

 

Part B

x+y+, x+y+, x-y-, x-y-

 

Part C

four-strand double crossover

answered Nov 22, 2012 by GeneX ~Top Expert~ (7,947 points)

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