Indicate which of the following statements is true regarding Mendelian genetics:
a) The phenotype of an individual is determined only by its genotype.
b) The law of segregation states that each individual has two alleles for each gene, which separate during gamete formation.
c) The law of independent assortment applies when two pairs of genes under study are on homologous chromosomes.
d) The parents must be purebred for the studied traits.

a) a and b are correct.
b) b and c are correct.
c) b and d are correct.
d) c and d are correct.