Transfer of a gene or genes through a virus is called
transformation
transduction
genetic engineering
sex-duction
Correct Answer :
B. transduction
Related Questions
The condition in which only one allele of a pair is present is known as
Homozygous
Heterozygous
Hemizygous
Incomplete dominance
The chromosomal theroy of heredity implies that
chromosomes are composed of DNA and protein
genes are composed of chromosomes
organism cannot live withoutchromosomes
genes are located on the chromosomes and are transmitted to the next generation through them.
Down's syndrome is an example of
monosomy
trisomy
triploidy
polyploidy
A colour-blind man marries the daughter of a colour-blind person. In their progeny
none of her daughters are colour-blind
all her sons are colour-blind
all her daughters are colour-blind
half of her sons are colour-blind
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
Which one of the following chemical characteristics is not common to all living beings ?
Similar triplet codes for amino acids
Energy is stored by high energy rich phosphate bonds
Types of protein present in the body.
Ribosomes act at sites of protein synthesis
A child is bom with an extra chromosome in each of its cells. This is usually the result of
nondisjunction
crossing over
segregation
hybridization
Diakinesis is characterised by
crossing over
synapse
chiasmata
terminalization
Colour blindness is caused due to
deficiency of vitamic C
sex-linked abnormality
absence of rods in retina
absence of visual purple in retina
The term 'meiosis' was coined bv
Herting and Van Beneden
Sutton and Boveri
Hofmeister and Waldeyer
Farmer and Moore
The number of characters investigated by Mendel was
four
seven
six
one
Among the following which is a test cross?
TtxTt
TTxTT
TTxTt
Ttxtt
Linked genes may be separated by the process of
gene mutation
segregation
crossing over
polyploidy
The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
fission
budding
asexual means
sexual means
The nuclear membrane completely disappears during
late prophase
early metaphase
metaphase
interphase
Chromosomes exhibit minimum coiling during
prophase
metaphase
interphase
telophase
A functional unit of a gene which specifies synthesis of one poly-peptide is known as
clone
recon
cistron
codon
An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as
monohybrid
dihybrid
trihybrid
backcross
Exhibition of superiority by a hybrid over both of its parents is called
heterosis
hybridization
hypostasis
dominance
How many meiosis will be required to produce 102 pollen-grains ?
25
25.6
26
26.5
When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
The first person to induce mutations was
Hugo de Vries
T.H. Morgan
Sturtevant
H.J. Muller
Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary in nature. Suppose T stands for dominant gene and t for recessive gene, the genetic make up of a person who cannot taste is
TT
Tt
tt
None of these
A chemical mutagen is
X-rays
UV-rays
-rays
5-Bromo-Uracil
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
The best method to determine whether an individual is homozygous or heterozygous is
inbreeding
cross-breeding
back-crossing
self-fertilization
DNA duplication occurs in
meiosis only
meiosis II and mitosis
mitosis only
meiosis I and mitosis
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
A giant chromosome having many chromo-nemata lying side by side all along their length is called
megachromosome
heterosome
polytene chromosome
super numerary chromosome
The scientists who rediscovered the Mendel's laws are
Mast and Pantin
Watson and Crick
Corren, Tschermark and Hugo de Vries
Khorana and Nirenberg