# UT BIO 325L - Homework4[key]Spring14 (3 pages)

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## Homework4[key]Spring14

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## Homework4[key]Spring14

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Pages:
3
School:
University of Texas at Austin
Course:
Bio 325l - Laboratory Experience in Genetics
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Name Lab room day time TA name Part 1 Sordaria Results Review the lab manual and lecture 1 Your goal is to determine the distance of the Tan locus from its centromere a 1 point Define a map unit also referred to as a centimorgan This should be a complete sentence and not the abbreviation given in lecture if you pull a definition from a source you should cite it Something along the lines of A map unit is the distance between a gene and its centromere or another gene which results in one percent crossover rates during meiosis b 1 point Your section data has a total number of scored asci showing an MI segregation pattern and the total number of scored asci showing an MII pattern Write your own formula for calculating map units using that data Remember that Sordaria has a particular quirk in this regard due to the spores being contained in asci Percent crossover rates is equal to m u so they just need to have a formula to calculate the percent of crossovers in their samples The quirk is that since a recombinant MII ascus shows both a set of recombinant and non recombinant spores they should take half of the of MII asci Examples Tan m u M2 M1 M2 Tan m u M2 asci total asci 2 They should have more than just percentage of M2 c 1 point Calculate the distance in map units of the Tan locus from its centromere Answers will depend on each section s data but should be the same for all students within a given section Patterns of inheritance This semester you are working to figure out the pattern of inheritance of 2 different lines of flies This task and its associated statistical tests are much easier if you can recognize or reason through the patterns you are seeing Last week you were asked to consider the hybrid outcomes of the F1 generation This week you will consider the patterns observed in the F2 resulting from an F1 sibling cross For the following questions you will get the safest results by doing the punnet square rather than just guessing When in doubt write it out For

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