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Use the information below to answer questions 1 – 4. Please note additional information between the questions to help you develop your answers. In Drosophila yellow body color (y) is recessive to grey, cut wing (c) is recessive to normal and white eyes (w) are recessive to red. True breeding yellow body, cut wing female flies (yycc) were crossed with white eyed males. All F1 females resulting from the cross were found to have a wild type phenotype but all males were yellow with cut wings. 1. Give the genotypes of the male and female flies of this cross (1 pts) Male fly genotype: Female fly genotype: 2. Assuming that genes controlling body color, wing shape and eye color are linked would you expect to find them on an autosome, the X or Y chromosome? (1 pt) Assume that a genetic map drawn for the chromosome showed the placement of yellow body color cut wing and white eyes as follow 3. Determine the map distance between the gene pairs (3 pts) y c w |--|--| 38 44 53 Gene Pair | Map Distance y - c | y - w | c - w | 4. Assume that crossing over occurred in F1 female Drosophila resulting from the cross described. Using the map distances you determined in the previous question calculate the % of each type of gamete that would be produced by the F1 female. Your answer should include the formula used for your calculations and all the work to receive the points (8 pts) 

          Use the information below to answer questions 1 – 4. Please note additional information between the questions to help you develop your answers.

In Drosophila yellow body color (y) is recessive to grey, cut wing (c) is recessive to normal and white eyes (w) are recessive to red. True breeding yellow body, cut wing female flies (yycc) were crossed with white eyed males. All F1 females resulting from the cross were found to have a wild type phenotype but all males were yellow with cut wings.

1. Give the genotypes of the male and female flies of this cross (1 pts)

Male fly genotype: 
Female fly genotype:

2. Assuming that genes controlling body color, wing shape and eye color are linked would you expect to find them on an autosome, the X or Y chromosome? (1 pt)

Assume that a genetic map drawn for the chromosome showed the placement of yellow body color cut wing and white eyes as follow

3. Determine the map distance between the gene pairs (3 pts)

y c w
|--|--|
38 44 53

Gene Pair | Map Distance
y - c |
y - w |
c - w |

4. Assume that crossing over occurred in F1 female Drosophila resulting from the cross described. Using the map distances you determined in the previous question calculate the % of each type of gamete that would be produced by the F1 female. Your answer should include the formula used for your calculations and all the work to receive the points (8 pts)
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Use the information below to answer questions 1 – 4. Please note additional information between the questions to help you develop your answers. In Drosophila yellow body color (y) is recessive to grey, cut wing (c) is recessive to normal and white eyes (w) are recessive to red. True breeding yellow body, cut wing female flies (yycc) were crossed with white eyed males. All F1 females resulting from the cross were found to have a wild type phenotype but all males were yellow with cut wings. 1. Give the genotypes of the male and female flies of this cross (1 pts) Male fly genotype: Female fly genotype: 2. Assuming that genes controlling body color, wing shape and eye color are linked would you expect to find them on an autosome, the X or Y chromosome? (1 pt) Assume that a genetic map drawn for the chromosome showed the placement of yellow body color cut wing and white eyes as follow 3. Determine the map distance between the gene pairs (3 pts) y c w |–|–| 38 44 53 Gene Pair | Map Distance y - c | y - w | c - w | 4. Assume that crossing over occurred in F1 female Drosophila resulting from the cross described. Using the map distances you determined in the previous question calculate the % of each type of gamete that would be produced by the F1 female. Your answer should include the formula used for your calculations and all the work to receive the points (8 pts)

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Biology for AP Courses
Julianne Zedalis, John Eggebrecht
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Use the information below to answer questions 1 - 4. Please note additional information between the questions to help you develop your answers. In Drosophila yellow body color (y) is recessive to grey, cut wing (c) is recessive to normal and white eyes (w) are recessive to red. True breeding yellow body, cut wing female flies (yycc) were crossed with white eyed males. All F1 females resulting from the cross were found to have a wild type phenotype but all males were yellow with cut wings. 1. Give the genotypes of the male and female flies of this cross (1 pts) Male fly genotype: Female fly genotype: 2. Assuming that genes controlling body color, wing shape and eye color are linked would you expect to find them on an autosome, the X or Y chromosome? (1 pt) Assume that a genetic map drawn for the chromosome showed the placement of yellow body color cut wing and white eyes as follow 3. Determine the map distance between the gene pairs (3 pts) Gene Pair | Map Distance y - c | y - w | c - w | 4. Assume that crossing over occurred in F1 female Drosophila resulting from the cross described. Using the map distances you determined in the previous question calculate the % of each type of gamete that would be produced by the F1 female. Your answer should include the formula used for your calculations and all the work to receive the points (8 pts)
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Transcript

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00:01 Here we're looking at an f1 generation where we're specifically looking at a female of the f1 generation who has one x chromosome with recessive y, recessive c, and dominant w, and the other x chromosome, dominant y, dominant c, recessive w.
00:17 So this is what we are starting with and we also know that the genes are in this order.
00:26 Y, first, middle of c, there's six, map you part and c is nine map units away from w.
00:34 So based on that, what should we expect of the progeny of this female given that they're crossed with a completely recessive male? so in order to calculate all of this, we're going to have to calculate it in four different steps.
00:49 First, we're going to calculate the number of double crossover events, then the number of single crossover events between y and c, single crossover events between c and w, and then non -recombinants, meaning they don't experience any crossing over events.
01:06 So starting off with double crossing over events, the way that we calculate this is we take the frequency of crossing over between y and c and c and w, and then we multiply that by the number of expected offspring.
01:20 So i say frequency because we're not just taking the number of map units.
01:24 Here, since the number of map units is 6, then the frequency of recombination in offspring for them to have recombined wide 6 is going to be .06.
01:40 So in order to calculate this for double crossing over, we're going to take that frequency .06, multiply by the frequency of c and w .09, and then multiply it by the expected number of progeny in the f2 generation.
01:56 Now since we're not specifically told how many offspring we should expect.
02:00 I'm just going to multiply this by 100%.
02:03 So that way we get percentages that you can work with for your f2 generation.
02:08 So when we do this for double crossover event, what we end up with is 0 .54%.
02:15 So you're expecting less than a percent of all the offspring to experience any kind of double crossing over event.
02:24 Now double crossing over events come in two different flavors.
02:30 Based on how the female chromosomes are, here where you have recessive, recessive, dominant, and then dominant, dominant, recessive, you would expect the double crossover chromosomes to look like recessive, dominant, or dominant, recessive, recessive.
02:53 And you see that they are, that is an inverse pair.
02:57 That's what you should expect...
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