The segment of DNA which participates in crossing over is known as
recon
muton
criston
replicon
Correct Answer :
A. recon
Related Questions
Lethal genes are those which
cause the death of the organism in which they are present
cause the death of the homozygous infant being formed
cause the death of heterozygous infant being formed
all of the above
A codon is a sequence of 3 nucleolides on
t-RNA
m-RNA
s-RNA
hn-RNA
A functional unit of a gene which specifies synthesis of one poly-peptide is known as
clone
recon
cistron
codon
When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
In the Operon concept, the regulator gene regulates chemical reactions in the cell by
inhibiting transcription of m-RNA
inactivating enzymes in the reaction
inhibiting the substrate in the reaction
inhibiting the migration of m-RNA into cytoplasm
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
A child is bom with an extra chromosome in each of its cells. This is usually the result of
nondisjunction
crossing over
segregation
hybridization
A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea plant If the plant is selfed, the genotype in the Fi generation is most likely to be
all tall
50% tall and 50% dwarf
all dwarf
data insufficient
Albinism in com plants is best described as
lethal
sex-linked
inbred
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.
Among the following which is a test cross?
TtxTt
TTxTT
TTxTt
Ttxtt
In a monohybrid cross the Fi ratio of a backcross is
1:1
3:1
1:2:1
9:3:3:3
Exhibition of superiority by a hybrid over both of its parents is called
heterosis
hybridization
hypostasis
dominance
DNA duplication occurs in
meiosis only
meiosis II and mitosis
mitosis only
meiosis I and mitosis
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
The nuclear membrane completely disappears during
late prophase
early metaphase
metaphase
interphase
Mutations which are not dominant are not lost by a gene pooL This is known as
Survival of the dominant
Survival of the recessive
Hardly-Weinberg law
None of these
The term 'meiosis' was coined bv
Herting and Van Beneden
Sutton and Boveri
Hofmeister and Waldeyer
Farmer and Moore
Transfer of a gene or genes through a virus is called
transformation
transduction
genetic engineering
sex-duction
Diakinesis is characterised by
crossing over
synapse
chiasmata
terminalization
The science dealing with study of inheritance and variation is
Genetics
Evolution
Morphology
Cytology
Crossing over in meiosis occurs in
leptotene
pachytene
diplotene
diakinesis
A chemical mutagen is
X-rays
UV-rays
-rays
5-Bromo-Uracil
The scientists who rediscovered the Mendel's laws are
Mast and Pantin
Watson and Crick
Corren, Tschermark and Hugo de Vries
Khorana and Nirenberg
The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
fission
budding
asexual means
sexual means
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
all heterozygous tall
two tall and two dwarf
one homozygous tall, two heterozygous tall and one homozygous dwarf
all homozygous dwarf.
Linkage is
directly related to crossing over
same as translocation
inversely related to crossing over
opposite to segregation
The best method to determine whether an individual is homozygous or heterozygous is
inbreeding
cross-breeding
back-crossing
self-fertilization