Answer:
3:1
Step-by-step explanation:
According to Mendel’s law of inheritance, in a monohybrid cross, dominant allele appears phenotypically in the F1 generation and on crossing between F1 hybrids, the ratio of dominant to recessive will be 3:1. Thus in the given question when the dominant purple flower is crossed with recessive white flower, the ratio of purple flower to white would be 3:1.