Introduction to Genetic Analysis 513

Introduction to Genetic Analysis 513 - 512 Chapter 15...

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Unformatted text preview: 512 Chapter 15 Large-Scale Chromosomal Changes hypothesis temporarily if we assumed that the mutation was in the normal parent, giving a gamete V S . Then the F 1 waltzer would be V S / v s, and if linkage were tight enough, few or no V s gametes would be produced, the type that are necessary to combine with the v s gamete from the male to give V s / v s normals. However, if this were true, the cross with the normal males would be V S / v s 3 V s / V s , and this would give a high percent- age of V S / V s progeny, which would be waltzers, none of which were seen. c. Nondisjunction in the normal parent This explanation would give a nullisomic gamete that would combine with v to give the F 1 waltzer the hemizy- gous genotype v . The subsequent matings would be v 3 v / v , which gives v / v and v progeny, all waltzers. This fits. v 3 V / V , which gives V / v and V progeny, all normals. This also fits. First intercrosses of normal progeny: V 3 V . This gives V and V / V , which are all normal. This fits....
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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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