University of Delhi 2006 B.Sc Zoology .(hons) - VII Genetics and Evolution - Question Paper

B.Sc.(hons) Zoology - Paper VII

Genetics and Evolution


Time :3 hour
Maximum marks :75


part [a] Genetics

Attempt 3 ques. from part A . ques. NO.1 is compulsory.

1. (a) discuss the subsequent :

i. Bombay phenotype
ii.Specialized transduction [mark 2]


(b)Distinguish ranging from ;

i. Dominant and recessive epistasis
ii. Sex limited and sex influenced traits
iii. Genotypes and genome
iv. Penetrance and expressivity of lethal gene [mark 6]

( c) describe :

i. plasmid
ii. Test cross
iii. codominance [mark 3]


(d) Mention the significant contribution of :

i. Mary Lyon
ii. Stern
iii. Lederberg and Tatum [mark 3]



2.
(a) define molecular mechanism of mutation [mark 6]
(b) define the mechanism of inheritance in the traits showing continuous variation [mark 6]


3.
(a) Describe 3 factor cross. discuss its importance in linkage mapping in eukaryotes. [mark 6]
(b) Describe methods to detect X linked recessive lethal mutation in Drosophila [mark 6]

4. Write short notes on any 3 of the subsequent :

i. Dosage compensation
ii. Y linked inheritance
iii. Sexduction
iv. Mechanism of sex determination in drosophila [mark 12]



part B Evolution


Attempt 3 ques. from part B. ques. no.5 is compulsory.


1.
(a) Explain the subsequent :
i.cocervate
ii.Position effect [mark 2]

(b) Distinguish between:
i. Transition and transversion
ii. Autopolyploidy and allopolyploidy
iii. K selection and r selection
iv. Allopatric and sympatric species [mark 8]

(c ) Mention the significant contribution of :

i. Stanley miller
ii. Karpechenko
iii. Kettlewell


2.Write an account of phylogenyof horse. [mark 6]

3. describe isolating mechanism. define different isolating mechanisms which prevent interbreeding various species. Add a note on their role in speciation. [mark 6]

4.Write short notes on any 3 of the following:

i. Neo Darwinism
ii. Recapitulation hypothesis
iii. Role of duplication in evolution of new genes
iv. Directional selection. [mark 12]

Earning:   Approval pending.