Introduction to Genetic Analysis 677

Introduction to Genetic Analysis 677 - 44200_20_p643-678...

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are uninterpretable, because the conditions of artiFcial rearing are interfering with the normal developmental program. b. If the results of the first experiments show some her- itability in the broad sense, then a further analysis is possible. This analysis requires a genetically segregating population, made from a cross between two dialect populations—say, A and B. A cross between males from population A and females from population B and the reciprocal cross will give an estimate of the average degree of dominance of genes influencing the trait and whether there is any sex linkage. (Remember that, in birds, the female is the heterogametic sex.) The off- spring of this cross and all subsequent crosses must be raised in conditions that do not confuse the learned and the genetic components of the differences, as re- vealed in the experiments in part a. If learned effects cannot be separated out, this further genetic analysis is impossible.
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