Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech Biotechnology GENETICS - I - Question Paper

Model Question Paper

BTBT2- GENETICS - I

Time : 3 hrs Maximum marks : 75

 

Instruction:

1. Question paper is divided into Group A, Group B and Group C

2. Each Group is 25 Marks

3. Figure to the right in bracket indicates marks.

4. Good Handwriting is expected

5. Assume suitable data if necessary.

 

Group A (25 Marks)

 

Answer any three questions (Question 1 is compulsory)

	(5)

 

Q.1 Describe Trihybrid and Multihybrid Crosses ?

(10)

Q.2 Define incomplete dominance and write in detail about codominance ?

(10)

Q.3 Twin studies are extremely useful for study of genes in relation to environment

Explain . Also give two examples where temperature could alter the expression of

a genotype. ?

(10)

Q.4 Explain Nilsson Ehle experiment done on red and white varites of wheat ?

(10)

Q.5 If one child in a family has blood group AB and another child O , what can you say

about the genotypes of their parents. Explain ?

Group B (25 Marks)

Answer any three questions (Questions 6 is compulsory)

	(5)

 

Q.6 Point out the similarities and differences between mitosis and meiosis ?

(10)

Q.7 Drosophila has 4 chromosomes considering any 3 genes at random, they will have

Equal chance to be located on only of the four chromosomes. What is the probability

that all 3 should be present on the same chromosomes ?

	(10)

 

Q.8 Write down the significance and factors affecting crossing over ?

	(10)

 

Q.9 Given reason, why extrachromosomal traits are mostly transmitted through the

Maternal parent. & Describe one example of a mutation in mitochondria that produces

a visible phenotype in a Fungus. ?

	(10)

 

Q.10. Write in detail BARR BODIES & LYONS HYPOTHESIS ?

 

 

 

 

 

 

 

 

Group C (25 Marks)

 

All Questions are Compulsory.

 

Q.11 Fill in the blanks ( each question carry 2 marks)

 

1. ________ is identified in the heterozygote by formation of a pairing loop at Pachytene .

2. The bar locus in Drosophila provides an explanation for _______ effect.

3. Normally ________ has 12 chromosomes in its haploid cells, therefore 12 different trisomics

are possible.

4. ________ are individual with an uneven number of individual chromosomes

5. The ABO Blood groups in man, provides illustration of a ___________

 

 

Q.11 Multiple choice question. (Each question carry 2 marks)

 

1. ________ is where segments of chromosomes are added.

a) Inversion b) Duplication c) Deletion d) Translocation

 

2. _________ is the second type of euploidy where the additional set of chromosomes comes from a different species.

a) Allopolyploidy b) Aneuploidy c) Polyploidy d) Maploids

 

3. A deficiency originates from breakage occurring at random in both chromatics of a chromosomes is called as _________

a) Terminal b) Interstitial c) Chromosomes Break d) Restitution

 

4. _________ can be detected by performing genetic crosses and observing gene segregation .

a) Translocation b) delection c) Inversion d) Restitution

 

5. Enzyme which catalyze the breakdown of particular bonds leading to fragmentation of nucleic

acids are called ________

a) Polymerases b) Ligases c) Swivelases d) Nucleases

 

Q.11 True or false (each question carry 1 marks).

 

1. A duplication involves attachment of a chromosomal fragment resulting in addition of one or

more geries to chromosomes.

2. Penetrance is the proportion of individual that does not show an expected phenotype.

3. There is gene is maize plants which controls anthocyanin pigment formation .

4. Sutton- Boreri theory stated that continuity of chromosomes from one cell division to the next.

5. In vegetative phase of Neurospora crassa life cycle, there is growth of filamentous, Coenocytic

hyphae to form the haploid mycelium.

 

 

 

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