GENETICS-supply 2009

Code No: RR212306 Set No. 1
II B.Tech I Semester Supplimentary Examinations, May/Jun 2009
GENETICS
(Bio-Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
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1. (a) Describe law of segregation
(b) law of independent assortment. [8+8]
2. What is the evidence that the genetic material of TMV {TobaccoMosiacV irus} is
RNA [6+10]
3. What two essential criteria must be met in order to execute a successful mapping
cross? [8+8]
4. Describe the conjugation process in F+ and F− bacteria. [8+8]
5. Draw and label the detail structure of metaphase chromosome. Write types of
chromosome found in human. [8+8]
6. Most mutations in a diploid organism are recessive. Why? [5+11]
7. Write the mechanism of sex determination in plants. [8+8]
8. A dextral snail is self fertilized and produces only sinistral progeny. What is the
probable genotype of this snail and its parents? [8+8]
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Code No: RR212306 Set No. 2
II B.Tech I Semester Supplimentary Examinations, May/Jun 2009
GENETICS
(Bio-Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. What properties of Fruit Flies and made them the organism of choice for genetics?
[5+11]
2. What is the difference in genetic material distribution in prokaryotic and eukaryotic
cells. Explain it’s consequences. [8+8]
3. Explain the experimental proof which forms the cytological basis of crossing over.
[8+8]
4. Distinguish among the three modes of recombination in bacteria. [5+5+6]
5. What are deletions? Illustrate your answer with suitable examples. [4+12]
6. What is replica plating? Comment on its significance. [6+10]
7. Why do we believe that humans with aneuploid karyotypes occur but are usually
inviable? [4+12]
8. What is kappa in Paramecium? [4+12]
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1 of 1
Code No: RR212306 Set No. 3
II B.Tech I Semester Supplimentary Examinations, May/Jun 2009
GENETICS
(Bio-Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. Distinguish between epistatis and polygenetic inheritance. [8+8]
2. The function ascribed to the genetic material are replication, expression, storage,
and mutation. What does each of these terms mean? [4×4]
3. What is the relationship between recombination frequency and genetic distance?
[8+8]
4. Describe in brief:
(a) Transduction
(b) Transformation. [8+8]
5. Give a concise account of numerical aberrations of human chromosomes. [6+10]
6. What is meant by a conditional lethal mutation? [4+12]
7. Define lyon hypothesis. [3+13]
8. A dextral snail is self fertilized and produces only sinistral progeny. What is the
probable genotype of this snail and its parents? [8+8]
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1 of 1
Code No: RR212306 Set No. 4
II B.Tech I Semester Supplimentary Examinations, May/Jun 2009
GENETICS
(Bio-Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. Define the terms:
(a) F1 generation
(b) backcross
(c) testcross
(d) pleotropism
(e) epistasis
(f) multiple factor inheritance
(g) give the genotypic ratios of a trihybrid cross using Fork method
(h) criss cross inheritance. [2+2+2+2+3+2+3]
2. Elaborate on the various contributions made in understanding transformation by
Griffith, Avery and his co-workers. [4+12]
3. Describe the mechanism of crossing over? [6+10]
4. Describe the basis for chromosome mapping in the Hfr x F- crosses. [4+12]
5. Give the gametic complement, in term of acentric, dicentric, duplication and defi-
ciencies. [4×4]
6. Describe tautomerism and the way in which theis chemical event may lead to mu-
tation. [3+13]
7. Contrast the evidence leading to the explanation of the different modes of sex
determination in Drosophila and humans. [8+8]
8. State on criteria of non mendelian inheritance. [4+12]
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