BIOL 103 Chapter Notes - Chapter 11: Electronvolt
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1. In fruitflies, scarlet eyes (s) is autosomallyrecessive to wild-type color; ebony body is autosomally recessiveto wild-type body. The traits are located on the 3rdchromosome & are 26 cM apart. A wild-type female istest-crossed (see cross below). Based upon the information given,complete the chart.
P: s + X s e
+ e s e
Genotype Phenotype Expected%
Total: 100% |
PHENOTYPE | EXPECTED FREQUENCY | OBSERVED FREQUENCY | (O â E) | (O â E)2 | (O â E)2/E |
Wild-type for both traits | 90 | ||||
scarlet & ebony | 85 | ||||
Scarlet & wild-type body | 275 | ||||
Wild-type eyes & ebony | 300 | ||||
Total | 750 total flies | 750 total flies | X2 = |
x^2= e(O-E)^2/E
Degrees of freedom (n) | 5% Probability Value (P) |
1 | 3.84 |
2 | 5.99 |
3 | 7.81 |
4 | 9.49 |
What are your degrees of freedom for thisquestion?___________ (n = phenotypes -1 )
Does the data fit the hypothesis/expected (have aX2 value < 5% P value for that n)?
_______________
Immunology worksheet help?
1. | In people infected with human cytomegalovirus, class I MHC andb2-microglobulin are produced, but very little mature class I MHCis found at the cell surface. Inhibition of which of the followingmolecules by human cytomegalovirus may account for thisphenomenon? | ||||||||||
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2. | Your chances of having the same MHC haplotype as your siblingare: | ||||||||||
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3. | Which of the following is the BEST example of self-MHCrestriction of T cells? | ||||||||||
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4. | MHC molecules: | ||||||||||
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5. | Tasmanian devils are a largely inbred population with littlediversity in the MHC. Which of the following would be a likelyoutcome of this? | ||||||||||
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6. | How many different MHC classical class I proteins does eachnucleated cell in a human heterozygous at the MHC locusexpress? | ||||||||||
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7. | MHC polymorphisms tend to cluster: | ||||||||||
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8. | A mutation that renders the MHC class II molecule DMnonfunctional would likely lead to: | ||||||||||
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9. | The human MHC locus is one of the most polymorphic regions ofthe genome. What does this mean? | ||||||||||
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10. | Which of the following is an example ofcross-presentation? | ||||||||||
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