the genetic distance between genes A and B is 10cM an organism with Ab combination of allelis is crossed with the organism aB combination of allelis.what will be the percentage of gametes with Ab allelis combination produced by an F1 ​indivisual​

Dear student 

The cross will be
Parents      Ab        x       aB

F1                         AaBb

Gametes        AB, Ab,  aB, ab

If the two loci A and B are 10cM apart, then 10 percent should be recombinant (AB and ab) and 90 percent should be parental Ab and aB among the four types of gametes. 

Ab should represent 1/2 of the parental type (90%) and is equal to 45 percent.

 
Hope this information clears your doubt about the topic.

Regards

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