According to Mendel's law of dominance, when a dominant trait is present, it will mask the presence of a recessive trait. If you're looking at a typical Mendelian cross involving one dominant trait (like purple flowers) and one recessive trait (like white flowers), the expected offspring ratio in the case of a heterozygous cross (Pp x Pp) would be:
- 25% homozygous dominant (PP)
- 50% heterozygous dominant (Pp)
- 25% homozygous recessive (pp)
In this case, the white flower trait would be the recessive one (pp). Therefore, you would expect 25 percent of the offspring to have white flowers.
So the correct answer is B 25.
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