In fruit flies, red eyes (pr _) are dominant to purple eyes (prpr) and normal wings (vg _) are dominant to vestigial wings (vgvg). The genes are located on the same chromosome. A pure breeding red-eyed fly with vestigial wings was crossed with a pure-breeding purple-eyed fly with normal wings. All of the F1 progeny had a WT phenotype. What represents the arrangement of alleles on the F1's chromosome?

F1) 100% wild type, Pr Vg / pr vg

     PrVg

     prvg    

Explanation:

Available data:

Cross:  A pure breeding red-eyed fly and vestigial wings with a pure-breeding purple-eyed fly and normal wings

Parentals)   Pr vg / Pr vg      x     pr Vg / pr Vg  

Gametes)   Prvg         prVg            

                  Prvg         prVg  

F1) 100% wild type, Pr Vg / pr vg

     PrVg

     prvg    

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs