Introduction to Genetic Analysis 517

Introduction to Genetic Analysis 517 - 516 Chapter 15...

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Unformatted text preview: 516 Chapter 15 Large-Scale Chromosomal Changes b. What is the ratio of normal-leaved to potato- leaved plants when you assume that p is not located on chromosome 6? 39. A tomato geneticist attempts to assign five recessive genes to specific chromosomes by using trisomics. She crosses each homozygous mutant (2 n ) to each of three trisomics, involving chromosomes 1, 7, and 10. From these crosses, the geneticist selects trisomic progeny (which are less vigorous) and backcrosses them to the appropriate homozygous recessive. The diploid progeny from these crosses are examined. Her results, in which the ratios are wild type:mutant, are as follows: strains to each other and perform crosses; a sum- mary of all their findings is shown here: Trisomic chromo- Gene some d y c h cot 1 48:55 72:29 56:50 53:54 32:28 7 52:56 52:48 52:51 58:56 81:40 10 45:42 36:33 28:32 96:50 20:17 Which of the genes can the geneticist assign to which chromosomes? (Explain your answer fully.) 40. A petunia is heterozygous for the following autoso-...
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