BIO/IV/04 Student's Copy
2 0 1 8
Pre-CBCS
4th Semester
BIOTECHNOLOGY
Paper BT-IV
Genetics
Full Marks 55
Time 2½ hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. The phenotypic ratio of offspring resulting from a dihybrid cross is
3 1
1 2 1
2 1 1
9 3 3 1
2. Crossing-over occurs during
diplotene
pachytene
zygotene
leptotene
/414 1 Contd.
3. A method to identify locus of gene and distance between genes is called
gene linkage
crossing-over
gene mapping
gene localization
4. The unidirectional transfer of genetic material from a donor to recipient
bacterium by cell to cell contact is termed as
transformation
conjugation
transduction
recombination
5. The term 'chromosome' was coined by
W. Flemming
W. Waldeyer
W. Sutton
T. H. Morgan
SECTION—B
Marks 15
Write short notes on the following 3×5=15
1. Punnett square method
2. Y-linked inheritance
3. Autosomal dominant traits
4. Retrotransposition
5. Inversion
BIO/IV/04/414 2 Contd.
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
1. Describe Mendel's experiment (Monohybrid Cross). 7
OR
Define multiple allelism. Explain with examples.
2. Explain in detail Lyon hypothesis. 7
OR
Describe Morgan's experiment and explain incomplete linkage in Drosophila.
3. Explain X-linked recessive mode of inheritance with the help of a
pedigree chart. 7
OR
Describe tetrad analysis in Ascomycetes.
4. Describe the mechanism of transformation in Bacillus subtilis. 7
OR
Describe the process of transposition of Tn3 elements.
5. Write a note on polytene chromosomes. 7
OR
Write a note on translocation and its effects.