An investigation of shrew tail length showed that the length of tails varied from 24mm to 66mm. In one generation recorded out of a population of 2,360 shrews only 2 were as long as 66mm.  In one cross between shrews both with 45 mm tails it was found that the offspring all had tails between 50 and 40 mm long. However, when the cross was repeated with another pair of 45mm shrews, this time the offspring tails varied between 24 and 66 mm long. Specify possible parental genotypes for the shrews used in the first and the second crosses.

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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An investigation of shrew tail length showed that the length of tails varied from 24mm to 66mm. In one generation recorded out of a population of 2,360 shrews only 2 were as long as 66mm.

 In one cross between shrews both with 45 mm tails it was found that the offspring all had tails between 50 and 40 mm long. However, when the cross was repeated with another pair of 45mm shrews, this time the offspring tails varied between 24 and 66 mm long. Specify possible parental genotypes for the shrews used in the first and the second crosses.

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