Introduction to Genetic Analysis 647

Introduction to Genetic Analysis 647 - large increase in...

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Unformatted text preview: large increase in the variation because there is now seg- regation of the genetic differences that were introduced from the two original parental lines. A demonstration that at least part of this variation is the result of genetic differences among the F 2 plants is seen in the F 3 . Differ- ent pairs of parents were chosen from four different parts of the F 2 distribution and crossed to produce the next, F 3 , generation. In each case, the F 3 mean is close to the value of that part of the F 2 distribution from which its parents were sampled. The outcome of the cross is clearly different from the results obtained when a cross is made between indi- viduals that differ in their allelic state for a gene with clear-cut phenotypic effects. Offspring do not sort into neat Mendelian ratios of 1:2:1, and there is much more individual variation within each generation of offspring. This behavior of crosses is not an exception; it is the rule for most characters in most species. Mendel obtained hisfor most characters in most species....
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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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