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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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.