UT BIO 325L - Homework11Spring2014[KEY] (3 pages)

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Homework11Spring2014[KEY]



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Homework11Spring2014[KEY]

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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 Crossing Over in Flies final challenge One more data set from this semester for the fly cross experiment this tells you what the P generation and F1 generation crosses were like was selected and is provided below You should use these data for the following questions wild type 822 Female yellow yellow body body w white wild eye type eye 0 6 white eye w wild type body 2 wild type 377 Male yellow yellow body body w white wild eye type eye 288 2 white eye w wild type body 38 White w Yellow y are both on the X chromosome and only 1 5 M U apart Let us see if the data obtained fits with a sex linked linked gene at 1 5 M U recessive inheritance model 1 Determine expected frequencies of each individual progeny possibility based on the 1 5 M U distance Do this by showing a punnet square for frequencies This one is challenging since it involves two genes both on the X chromosome and we are going to assume that crossing over does not happen in males However we are still going to ignore the effects of multiple crossover events a 1 5 points First determine what gametes each adult of the F1 can produce don t calculate probabilities yet You may need to consider sex linkage and lack of male crossing over to determine this Remember this is class data so the P generation was affected males crossed to homozygous wild type females The F1 adults are X Y and X Xyw X X y w X y X w X Y Note that a lack of crossover in males doesn t actually come into play here since the male is hemizygous Students may represent this in slightly different ways I think using superscripts work better to differentiate between the X and Y I m using parentheses in the square above just make it visually more clear that they are both on the X b 1 point Which gametes represent the parental type Which are nonparental and so therefore are a result of crossing over The X and Xy w are the parental types The Xy and X w are the non parentals They don t have to specify the Y chromosome as



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