Introduction to Genetic Analysis 140

Introduction to - 44200_04_p115-150 11:53 AM Page 139 Solved problems 139 The two parental classes are always equal and so are the two recombinant

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139 Solved problems The two parental classes are always equal, and so are the two recombinant classes. Hence, the probability that the frst child will have nail-patella syndrome and blood type B is 40.6 percent. 2. The allele b gives Drosophila Fies a black body, and b 1 gives brown, the wild-type phenotype. The allele wx o± a separate gene gives waxy wings, and wx 1 gives nonwaxy, the wild-type phenotype. The allele cn o± a third gene gives cinnabar eyes, and cn 1 gives red, the wild-type phenotype. A ±emale heterozygous ±or these three genes is test- crossed, and 1000 progeny are classifed as ±ollows: 5 wild type; 6 black, waxy, cinnabar; 69 waxy, cinnabar; 67 black; 382 cinnabar; 379 black, waxy; 48 waxy; and 44 black, cinnabar. Note that a progeny group may be specifed by listing only the mutant phenotypes. a. Explain these numbers. b. Draw the alleles in their proper positions on the chromosomes o± the triple heterozygote. c. I± it is appropriate according to your explanation, calculate inter±erence.
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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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