BZYCT-137 EM 2025 SOLVED ASSIGNMENT

Description

Bachelor’s Degree Programme
(BSCG)
BZYCT-137: GENETICS AND EVOLUTIONARY BIOLOGY
Valid from 1st January, 2025 to 31st December, 2025
ASSIGNMENT
(Tutor Marked Assignment)

Course Code: BZYCT-137
Assignment Code: BZYCT-137/TMA/2025
Maximum Marks: 100

Note: Attempt all questions. The marks for each question are indicated against it.

1. i) How is co-dominance different from incomplete dominance?
ii) Explain the phenomenon of masking the expression of a gene by
another in epistasis.
(5)
(5)
2. i) In Drosophila, the recessive, sex-linked genes, abnormal eyes facet
(fa) and singed bristles (sn) show 18 percent recombination.
a) If a singed male is crossed to a 

fa
fa female, what phenotypes are
expected in the F1?
b) If the F1 males and females are inbred, what phenotypic
proportions would be expected to occur in F2 males and females?
ii) Two recessive genes, ds and mp are present in corn. These are linked
and are 20 map units apart. From the cross:
mp
ds

   
mp ds
What percentage of the progeny would be expected to be both ds and
mp in the phenotype?
(5)

(5)
3. a) In the following statements, choose the alternate correct word given in
parenthesis.
i) The DNA regions in chloroplast could be observed under (light
microscope/electron microscope).
ii) The regions containing cpDNA are called (nucleoids/celluloids).
iii) Each nucleoid contains (a single/a few) copies of DNA.
iv) The cpDNA and mtDNA are usually (circular/linear) in nature.
v) Both chloroplast and mitochondria contain (a few/many) copies
of DNA.
vi) The mtDNA of yeast is (bigger/smaller) than mtDNA of humans.
vii) The occurrence of introns is discovered in (yeast/human).
b) Which among the following statements are correct?
i) Mitochondria contain 80 S ribosomes.
ii) The mRNA encoded by nuclear genes for the smaller subunit of
RuBisCo is translated in the chloroplast.
iii) The inheritance of chloroplast genome is independent of nuclear
genome.
(7)

(3)
4.
i)
(5)
Define mutation. Explain the following types of mutations briefly:
a)
Induced mutations
b)
ii)
Suppressor mutations
What are transposable genetic elements? How they can cause
mutations?
5.
6.
7.
8.
9.
i)
ii)
Industrial melanism is an excellent model to demonstrate the natural
selection in action. Analyze the above statement critically.
What do you understand by sexual selection? Illustrate your answer
with a suitable example.
Define the following terms:
i)
Heterozygous
ii)
iii)
iv)
v)
Chromosome mapping
Genetic drift
Frame shift mutation
Dosage compensation
What is speciation? Explain the mode of speciation.
i)
Write a note on the applications of polyploidy.
ii)
Explain the natural causes of extinction of a species.
Explain the Trisomy 13 – Patau syndrome in detail.
10. Explain in detail the technique used for determining the age of rocks.