oo Sprint F 1017 PM Files Practice Exam 2 answers.docx 5. Curly wing.pdf

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oo Sprint F 10:17 PM Files Practice Exam 2 answers.docx 5. Curly wings is a dominant mutation in the second chromosome of Drosophila melanogaster: A Cy/+ female was irradiated with X-rays (which makes chromosome breaks), and crossed with normal males. The Cy+ sons were mated individually with normal males. From one cross, the progeny were: curly males curly females 157 wildtype males 142 wildtype females 0 What is unusual about these results? is located on an autosome, but it is acting as though it is sex-linked in this cross. What abnormality in chromosome structure is the likely cause of these results? A translocation between chromosome 2 carrying Cy and the Xchromosome would create pseudo-linkage between Xand 2, and could account for this result. 6. Atransducing lysate is made from cells with the genotype pur pro his using bacteriophage P1. This is used to transduce cells of the genotype pur pro his Transductants containing pur were selected and tested for the unselected markers pro and his. The numbers of pur colonies of each genotype were: pro his 02 pro his 25 pro his 160 pro his What is the order of these three genes? Courses Calendar To Do Notifications Messages Solution 5. Curly type is observed only in females and not in males, But the gene for curly ness is located in chromosome number 2, Hence it is autosomal linked. But the results of the cross suggest as such it is sex linked because only females have curly type and males do not have curly genes. The possible explanation for this kind of occurrence is provided in the second part of the question, that due to chromosomal break in the 2nd chromosome and x chromosome they have rejoined and it behaves as a sex linked inheritance instead of autosomal inheritance..

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