Answer: The correct answer for the fill in the blank is A) Zero.
According to Mendel's law of dominance, in a cross between parents that are true breeding for a contrasting trait (like plant with pure purple and white flowers), only one form is expressed in the next generation and that form is called dominant trait.
As per the Mendelian inheritance, purple flower color is dominant over white flower color. When parents that are pure breeding for purple and white flower ( PP and pp) are crossed, they will produce all purple flowers ( Pp) in the first generation as purple is dominant trait.
Thus, percent of offsprings with white flowers is zero.
