Multiple choice Genotypic ratio of a monohybrid cross is 1 : 2 : 1 3 : 1 9 : 3 : 3 : 1 1 : 1 : 1 - Reveal answer Fill a bubble to check yourself A Correct answer Explanation The 1 : 2 : 1 ratio is the result of a monohybrid cross between two heterozygous parents.