PATHOLOGY

Detailed explanation-1: -An organism with a genotype of PP will have a phenotype of purple flowers, since two copies of the dominant allele (P) are present. An organism with a genotype of Pp will also have a phenotype of purple flowers, since one copy of the dominant allele (P) is present.

Detailed explanation-2: -The homozygous dominant flower will have the genotype PP and the homozygous recessive flower will have the genotype pp. The Punnet square below represents the cross between these two flowers. As you can see, all offspring will have the heterozygous genotype Pp, and will display the dominant phenotype of purple flowers.

Detailed explanation-3: -In this situation, every offspring produced from this cross with be a heterozygote (Pp), and because purple is dominant to white, all the offspring will be purple. Therefore, the probability of an offspring having white flowers is zero.

Detailed explanation-4: -All of the offspring have the same genotype: Pp. The dominant allele, P, in each genotype ensures that all of the offspring will be purple-flowered plants. The recessive allele, p, may be passed on to the next generation.