lFo S 2..010
81.. No. 16.347
DP·CIIA.OSO I
11
ZOOI.JOGY

II
Time Allowed: THree Hours IMaximuiri Marks: 200 l
INSTRUCTIONS
Calldiilates should attelllpt questiolls 1 and 5 widell are compulsory, and any THREE oftlte remailling questions selecting at least ONE question froIlI each Section.
The marks carried by-each question are indicated at the elld of el'ery question,"
Answers mllst be written ill ENGL1SIJ( .
Neat lliay be ,drawn, ,iJllerever .required.
(Contd.)

Section
1•.Answer any.four of the 4xl0=40
Give an account of the genetic code with.a special note on degenerate and 'nonsense ·codons,
Describe the function of "Holliday inter­mediate" in recombination.

According. to "Hardy-Weinberg'} law of genetic .equilibrium if the frequency of a recessive alle is q and that of a dominant allele is "1 'what will be the frequency of a heterozygote? Subslantiate your answer"with necessary explanation.
Differentiate between Homohabilis and Homo­ereclus.
(e)Describe the role of lipids I1l fluidity of biomembranes.
2. Explain gene regulation 'taking lac operon in bacteria as an exampie. 40
3. Describe the events in the evolution of Equus. 20
What is a trans'genic animal? Describe the methods of gene lransfer, the production and application of transgenic animals with a note-on the environmental implications. 20

4 (a)Describe various nlethods adopted In age detetlnination of fossils. . 10
(b)What are Coacervates? Describe their role in evolution. 10
What is phenylketonuria Describe its implications. 10
Differentiate between "Mullerian" and 'Batcsian" mimicry. 10
..
Section
5..Distinguish between any four of the following:
4x10=40 ..
Glucocorticoids and mineralocorticoids
(b)Neuromuscular Junction and synapse
Macrophagcs and lcucocytcs
Essential anlin9 acids and non-essential amino acids'
(e)Rods and Cones
6.Explain the role of, hormone receptors in elaborating the action of honnones on target organs with emphasis on B-adrenergic receptors and epine­phrine. Describe the mctabolism of honnone receptors. . 40
With suitable diagrams. describe isotonic and isometric contraction of a skeletal· muscle. 20 ..
Compare the fate maps of a gastrula in frog and chick. 20
Describe the structure ·of Organ of Coni" and its physiological role. 10
Describe the. Osmorcg"ulatory nlcchanism 9f marine animals. -10 . (c)Give an account of origin and -physiologjcal Jlluturation of erythrocytes and lcucocytes. 10
Explain .the phenom.enon of multiple ovulation and its application. 10