CS/B.Sc (H)/GENET/BT/MOL.BIO/MICRO.BIO/SEM-2/PTG-202/2012
2012
PRINCIPLES OF TRANSMISSION GENETICS
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
GROUP – A
( Multiple Choice Type Questions )
1. Choose the correct alternatives for any ten of the following :
10x1 = 10
i) If we cross a pea plant that is homoygous dominant for
tallness and that is heterozygous, what will be the
genotypes of the offspring that are tall ? ( D and d
represent the alleles for height in pea plants )
a) All will DD b) Dd in most cases
c) Dd only d) DD or Dd.
ii) Which is the correct indication for Mendel's Law of
Segregation ?
a) A cross between parents pure for a certain trait
will produce hybrids
b) Chromosomes move apart during anaphase II of
meiosis
c) For genes that are not on the same chromosome,
alleles assort independently of one another into
gametes
d) Alleles of gene are sorted into separate sex cells
and then recombine with another alleles at
fertilization.
iii) How many linkage groups are present in Drosophila ?
a) 8 b) 4
c) 6 d) 2.
iv) The ratio for dominant epistasis action is
a) 9 : 7 b) 9 : 3 : 4
c) 12 : 3 : 1 d) 15 : 3.