Question

Nucleotide composition of viral genome is, a=10,u-20,c=40,g=30.What is genome

Answer 1

First let’s go through the matings, assuming pr and vg are on different chromosomes.  In the following notation, alleles above the horizontal line are from one homologous chromosome, and alleles below the line are from the other homologous chromosome.

 

               Parents:                    pr        vg                    x          pr+      vg+

                                                pr        vg                                pr+      vg+

 

               F1:                            pr        vg       

                                                pr+      vg+

 

               F1 backcross:           pr        vg        male     x          pr        vg        female

                                                pr+      vg+                              pr        vg