New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    In a dihybrid cross involving two heterozygous parents

    (AaBb × AaBb), what is the expected phenotypic ratio, assuming independent assortment and complete dominance?
    A 3:1 Correct Answer Incorrect Answer
    B 9:3:3:1 Correct Answer Incorrect Answer
    C 1:1:1:1 Correct Answer Incorrect Answer
    D 1:2:1 Correct Answer Incorrect Answer
    E 9:6:1 Correct Answer Incorrect Answer

    Solution

    In a dihybrid cross (AaBb × AaBb), using Mendel’s law of independent assortment, the phenotypic ratio follows 9:3:3:1, where: 9 = dominant for both traits 3 = dominant for A, recessive for B 3 = recessive for A, dominant for B 1 = recessive for both traits

    Practice Next

    Relevant for Exams: