Sort the following answers based on whether or not they are valid statements about Mendel's experiments.
a) All the members of Mendel's F1 generations exhibited the same phenotype.
b) Mendel's P generation included plants that were homozygous for different alleles of the same trait.
c) Some members of Mendel's F2 generation are heterozygous.
d) Which of Mendel's generations produced offspring of only one genotype?