The image above shows a double Holliday junction formed duri
     The image above shows a double Holliday junction formed during processing of a double strand DNA break. If the Holliday junctions were resolved using the cleavage sites specified by the arrow points, what allelic combination of genes A and B would be produced?  both AB  both ab  AB, Ab  AB, ab 
  
  Solution
The allelic combinations formed after both ab. The reason is the cleavage sight indicate the allelic combination

