Answered

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A population of crabs living on a sandy beach exhibits three colors: dark brown, light

brown, and speckled. The genotypes for these colors are BB for dark brown, bb for light

brown, and Bb for speckled. If a dark brown crab were crossed with a light brown crab,

what would be the probable phenotypic ratio of their offspring?

Sagot :

marianaegarciaperedo

Answer:

100% of the progeny will be speckled

Explanation:

Available data:

  • Three colors: dark brown, light  brown, and speckled.
  • The genotypes for these colors are BB for dark brown, bb for light brown, and Bb for speckled.

Cross: dark brown crab  with a light brown crab

Parentals) BB     x     bb

Gametes) B   B        b    b

Punnett square)

                     B        B

            b      Bb      Bb

             b     Bb      Bb

F1) Genotype:

     4/4 = 100% of the progeny will be heterozygous for the trait, Bb

     Phenotype:

    4/4 = 100% of the progeny will be speckled

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