Question

when a purple coloured pea flower is crossed with a white colour pea flower, all offsrings were purple colour in f1 whereas there were both purple and white flowers in f2 is the 3:1 Respectively explain the result with a Cross, state which is dominant character and why​

Answer 1

A monohybrid cross is a mating between two individuals with different alleles at one genetic locus of interest.  

The cross between PP (purple flowers) and pp (white flowers) will produce pea plant having purple flowers having genotype Pp. P would be a dominant trait and p is a recessive trait, therefore plants having Pp genotype would be of purple colored.