Bios140 week 3 ilab – mendelian genetics (fly lab) devry university
BIOS140 Week 3 iLab – Mendelian Genetics (Fly Lab) Devry University
Preview of solution:
PART 1
(5 pts)
The ratio is 1.000:1.082. I did expect their male ratio be higher because males are usually the dominant ones. In addition there were 526 males and only 486 females.
Is sepia eye color dominant or recessive to wild type? Why? (2 pts)
Sepia eye color is recessive because wild type eyes are the normal in fruit flies. But if you cross two sepia eye color flies, sepia would be dominant.
Are the phenotypes of the F1 offspring what you would have predicted for this cross? What phenotypic ratio did you expect when you crossed two individuals from the F1 generation? (2 pts)
Yes because fruit flies are wild types. Since all F1 offspring are heterozygous, they are wild types which makes sepia eye color recessive.
PART 2
You will now perform 4 genetic crosses where you chose the mutant phenotype. Include in the information below the mutation that you have chosen. Include the name of the mutant phenotype and its abbreviation. For example, the phenotype of Sable Body has an abbreviation of: “S.” The Fly Lab has a listing of all Genetic Abbreviations for reference. When you chose a mutant phenotype as you design your fly, the abbreviation for the mutation will be indicated.
Is white dominant or recessive to wild type? Why? (2 pts)
White eye color is recessive because all fruit flies are wild type eye colors. If there two fruit flies with the same dominant color then you can get a white eye color.
Are the phenotypes of the F1 offspring what you would have predicted for this cross? What phenotypic ratio did you expect when you crossed two individuals from the F1 generation? (2 pts)
Yes because fruit flies are wild types. Since all F1 offspring are heterozygous, they are wild types which makes white eye color recessive.
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Preview of solution:
PART 1
Experiment A. wt ♀ x wt ♂
What is the ratio of male to female offspring? Is this what you expected to see? Why or why not? (5 pts)
The ratio is 1.000:1.082. I did expect their male ratio be higher because males are usually the dominant ones. In addition there were 526 males and only 486 females.
Experiment B. wt ♀ x (sepia) ♂
Data: 3 pts| Experiment B | Number wild type (+) | Number Sepia (SE) | |
| F1 Generation | 7423 | 2435 | |
| F2 Generation | 4974 | 5057 | 1.000:1.017 |
Is sepia eye color dominant or recessive to wild type? Why? (2 pts)
Sepia eye color is recessive because wild type eyes are the normal in fruit flies. But if you cross two sepia eye color flies, sepia would be dominant.
Are the phenotypes of the F1 offspring what you would have predicted for this cross? What phenotypic ratio did you expect when you crossed two individuals from the F1 generation? (2 pts)
Yes because fruit flies are wild types. Since all F1 offspring are heterozygous, they are wild types which makes sepia eye color recessive.
PART 2
You will now perform 4 genetic crosses where you chose the mutant phenotype. Include in the information below the mutation that you have chosen. Include the name of the mutant phenotype and its abbreviation. For example, the phenotype of Sable Body has an abbreviation of: “S.” The Fly Lab has a listing of all Genetic Abbreviations for reference. When you chose a mutant phenotype as you design your fly, the abbreviation for the mutation will be indicated.
Experiment C. wt ♀ x (white) ♂
Data: 3 pts| Experiment C | Number wild type (+) | # (White Eye color) (W) | ||
| F11 Generation | 743 | 246 | ||
| F2 Generation | 774 | 239 | Ratio: 3.238:1.000 | |
Is white dominant or recessive to wild type? Why? (2 pts)
White eye color is recessive because all fruit flies are wild type eye colors. If there two fruit flies with the same dominant color then you can get a white eye color.
Are the phenotypes of the F1 offspring what you would have predicted for this cross? What phenotypic ratio did you expect when you crossed two individuals from the F1 generation? (2 pts)
Yes because fruit flies are wild types. Since all F1 offspring are heterozygous, they are wild types which makes white eye color recessive.
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24*7 Live chat with Experts
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