Question

If purple flower color is dominant over white flower color, how can two purple flowered parents produce white flowered offspring

Answer 1

Both parents are heterogeneous, meaning that their genotype most likely appears as so - PW or Purple White.

If white is the recessive trait, then in a punnet square it would only have a 25% chance of appearing in the offspring while the other 75% would be purple. 50% being heterogeneous genotypes and the final two being homogeneous.

Therefore, the two purple flowered parents can produce a white flowered offspring due to the fact that they both are heterogeneous and hold the recessive trait of white.

Hope this helps!