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Biology LibreTexts

Dihybrid Crosses in Guinea Pigs

  • Page ID
    21249
  • A cross (or mating) between two organisms where two genes are studied is called a DIHYBRID cross. The genes are located on separate chromosomes, so the traits themselves are unrelated.

    cross 1.png

    BB = black
    Bb = black
    bb = white
    LL = short hair
    Ll = short hair
    ll = long hair

    Practice

    1. Fill out the genotypes of each of the offspring to determine how many of each type of offspring are produced.

    male and female gametes.png

    offspring.png

    2. How many of the offspring (out of 16) are:
    Black, Short ______
    Black, Long ______
    White, Short ______
    White, Long ______

    cross 2.png

    3. How many of the offspring are:
    Black, Short ______
    Black, Long ______
    White, Short ______
    White, Long ______

    cross 3.png

    4. How many of the offspring are:
    Black, Short ______
    Black, Long ______
    White, Short ______
    White, Long ______