Introduction to Genetic Analysis 643

Introduction to Genetic Analysis 643 - 44200_19_p611-642...

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a. What are the allele frequencies in this population? b. In this population, mating is always with like phe- notype but is random within phenotype. What geno- type and allele frequencies will prevail in the next generation? c. Another type of assortative mating takes place only between unlike phenotypes. Answer the pre- ceding question with this restriction imposed. d. What will the end result be after many genera- tions of mating of each type? 18. A Drosophila stock isolated from nature has an aver- age of 36 abdominal bristles. By the selective breed- ing of only those Fies with the most bristles, the mean is raised to 56 bristles in 20 generations. a. What is the source of this genetic Fexibility? b. The 56-bristle stock is infertile, so selection is re- laxed for several generations and the bristle number drops to about 45. Why doesn’t it drop back to 36? c. When selection is reapplied, 56 bristles are soon attained, but this time the stock is not infertile. How can this situation arise? 19.
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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