If in a monohybrid cross you end up with a 1-2-1 genotype ratio for the offspring, What can you deduce about the parents?

both parents are heterogeneous

Explanation:

This can be determined by a punnet square. If a punnet square is created with two heterogeneous parents (example: Bb x Bb), it will result in a 1:2:1 ratio for the genotypes. 1 with two dominant alleles (BB), 2 with one dominant and one recessive allele (Bb), and 1 with two recessive alleles (bb). 1 BB-2 Bb-1 bb