Bsc 4th semester/CBCS /Dibrugarh University/Economic Botany Question Paper2020
Total No. of Printed Pages—3
3 SEM TDC BOTH (CBCS) C 7
2 0 2 0
( Held in April–May, 2021 )
BOTANY
( Core )
Paper : C–7
( Genetics )
Full Marks : 53
Pass Marks : 21
Time : 3 hours
The figures in the margin indicate full marks
for the questions
1. Choose the correct answer of the following :
1×5=5
(a) Segregation of genes takes place during
metaphase/anaphase/prophase/zygote
formation.
(b) The phenotypic ratio of a haploid
organism is 1 : 2 : 1/3 : 1/1 : 1/9 : 3 : 3 : 1.
(c) Variability may originate during meiosis
due to crossing-over/chromosomal
aberrations/polyploidy/mutations.
16-21/477 ( Turn Over )
( 2 )
(d) Frameshift mutations occur when
base is deleted/added/added or deleted/
None of these.
(e) A well-known autosomal abnormality at
birth is Klinefelter’s syndrome/Down’s
syndrome/Patau’s syndrome/Turner’s
syndrome.
2. Write short notes on any three of the
following : 4×3=12
(a) Genetic drift
(b) Epistasis
(c) Position effect
(d) Reciprocal translocation
(e) Allelomorph
3. What do you mean by extra-chromosomal
inheritance? How does it differ from
Mendelian inheritance? Describe it with
suitable example. 2+2+8=12
Or
Write short notes on the following : 6+6=12
(a) Inheritance of Kappa particle in
paramecia
(b) Variegation in four o’clock plant
.
4. Define gene mutation. How different types
of radiation can cause mutation? Explain
clearly the CIB method for the detection of
gene mutation. 1+3+8=12
Or
Write the difference between the following :
4×3=12
(a) Incomplete dominance and
Codominance
(b) Interference and Coincidences
(c) Euploidy and Aneuploidy
5. What is law of independent assortment? Why
is it not universally accepted? Illustrate it
with suitable example. 2+2+8=12
Or
What is crossing-over? How does it differ
from chiasma? Describe briefly the
mechanism of crossing over. 2+2+8=12.
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