As a result of cross-fertilization of true breeding pea plants having purple-colored flowers with that white colored flowers, the offspring will have flowers with:

Explanation

Yes, the offspring of cross-fertilization of true breeding pea plants having purple-colored flowers with that of white-colored flowers will have all purple flowers. True breeding pea plants are homozygous for the trait of flower color, meaning they have two copies of the same allele for flower color. The allele for purple flower color is dominant, while the allele for white flower color is recessive. When a true breeding pea plant with purple flowers is crossed with a true breeding pea plant with white flowers, all of the offspring will be heterozygous for flower color, meaning they will have one copy of the dominant allele for purple flower color and one copy of the recessive allele for white flower color. The phenotype of the offspring will be determined by the dominant allele. Since the dominant allele for purple flower color is dominant, all of the offspring will have purple flowers. Here is a table that summarizes the results of a cross-fertilization between a true-breeding pea plant with purple flowers and a true breeding pea plant with white flowers: