Question

a purple flower with an unknown genotype is crossed with a white flower .Determine the genotype of the purple if purple (P) is dominant and white (p) is recessive

Answer 1

   (Pp is the purple flower with the unknown genotype, pp is the white flower)

First scenario:
                                               Pp x pp 
       first generation:         Pp   Pp  pp  pp   (two purple, two white flowers)

Second scenario:              
                                               PP x pp
    second generation :     Pp  Pp  Pp  Pp  (four purple flowers)