Mastering Genetics: Homework 9 due Mon Mar 27 11:59pm: chapt 12-12 6- Google Chr
ID: 172459 • Letter: M
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Mastering Genetics: Homework 9 due Mon Mar 27 11:59pm: chapt 12-12 6- Google Chrome Secure https:// ession masteringgenetics.com/myct/itemVi 4932886 signed in as Tasnuva Tarek BIOL203-Hunter College-Spring 201 Practice Problem 76 Resources previous l 9 of 15 l next Practice Problem 76 Part B P-elements are a type of transposon commonly used in The researcher then crosses the F1 males (XPumm wmure Y: transposase to female flies that are homozygous for the white mutation ila (fruit fly) research. A common ma ker for P. She selects F2 males that have eye pigment present (indicating that they have a P {minivvhite insertion somewhere in their genome) elements is the miniwhite gene, an engineered version of the white locus. Flies mutant for the natural white have Why does the researcher select these F2 males? Select a statements that are true white eyes instead of wild-type red eyes. A miniwhite gene on a P-element in a white mutant will produce eye pigment, and will act as a dominant marker indicating In this cross, most F2 males will have eye pigment because they inherit the X hife J chromosome with a P-element that did that the P-element is present. not move P-elements used for research are nonautonomous. In this cross, most F2 males will have no eye pigment because they cannot inherit the X chromosome that had the original P meaning that they do not encode their own transposase The transposase is supplied using a second locus, where {miniwhite nsertion on it the transposase enzyme is no longer within a transposon In this cross, F2 males with eye pigment result from the P-element moving to a new location on an autosome and thus is immobilized (meaning that it cannot move itself). For flies with both a nonautonomous P-element and immobilized transposase, the P-elernent can move In this cross, F2 rnales with eye pigment result frorn the P-element remaining at its original location on the X chromosorne. within the genome My Answers Give Up Submit Part C This question will be shown after you complete previous question(s) Provide Feedback Continue Ask me anything 3/26/2017Explanation / Answer
The female flies are homozygous for mutant allele and produce white pigment. The males are heterozygous with miniwhite+ gene and transposase. The F2 flies resulted would be heterozygous containing white pigment and as well as the transposase enzyme encoding gene. The F2 flies are selected because they contain P element encoding white mutant allele inserted soewhere in the genome. Since, P element is nonautonomous, it is able to move to other location with the help of transposase enzyme inherited through Y gene. Therefore, Option 3 is correct.