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Problem

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question

There are two highly inbred strains of laboratory mice whose adult body weights are very different. Assume that the mouse's body weight is under the control of three pairs of contrasting genes: A vs. a, B vs. b and D vs. d. Assume further that each capital letter gene is responsible for contributing 5.0 grams to the total body weight, and that lowercase letters contribute 2.5 grams to total body weight. The average weight of mice in Strain I is 30 grams, while that of Strain II mice is 15 grams. (a) What are the most likely genotypes of these two strains? (b) Suppose Strain I and Strain II are crossed. What will be the phenotype of the F_1 progeny?

category

biology

options

  1. Strain I: AABB DD, Strain II: aabb dd, F_1 progeny: 20g
  2. Strain I: AAbb DD, Strain II: aaBB dd, F_1 progeny: 25g
  3. Strain I: AA BB DD, Strain II: aabb dd, F_1 progeny: 22.5g
  4. Strain I: AABB, Strain II: aabb, F_1 progeny: 20g
  5. Strain I: AABB Dd, Strain II: aabb DD, F_1 progeny: 21.25g
  6. Strain I: AA BB DD, Strain II: aa BB dd, F_1 progeny: 30g
  7. Strain I: AA BB DD, Strain II: aa bb DD, F_1 progeny: 27.5g
  8. Strain I: Aa Bb Dd, Strain II: Aa Bb Dd, F_1 progeny: 30g
  9. Strain I: AA bb dd, Strain II: aa BB DD, F_1 progeny: 22.5g
  10. Strain I: AA bb DD, Strain II: aabb dd, F_1 progeny: 25g

src

stemez-Genetics

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