Introduction to Genetic Analysis 511

Introduction to Genetic Analysis 511 - 44200_15_p481-520...

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510 Chapter 15 Large-Scale Chromosomal Changes 1. A corn plant is obtained that is heterozygous for a reciprocal translocation and therefore is semisterile. This plant is crossed to a chromosomally normal strain that is homozygous for the recessive allele brachytic ( b ), located on chromosome 2. A semi- sterile F 1 plant is then backcrossed to the homozy- gous brachytic strain. The progeny obtained show the following phenotypes: All the progeny from this cross will be heterozygous for the chromosome carrying the brachytic allele, but what about the chromosomes involved in the transloca- tion? In this chapter, we have seen that only alternate- segregation products survive, and that half of these sur- vivors will be chromosomally normal and half will carry the two rearranged chromosomes. The rearranged com- bination will regenerate a translocation heterozygote when it combines with the chromosomally normal com- plement from the normal parent. These latter types— the semisterile F1’s—are diagrammed as part of the
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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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