A functional unit of a gene which specifies synthesis of one poly-peptide is known as
clone
recon
cistron
codon
Correct Answer :
C. cistron
Related Questions
The number of characters investigated by Mendel was
four
seven
six
one
Albinism in com plants is best described as
lethal
sex-linked
inbred
dominance
The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
fission
budding
asexual means
sexual means
In a monohybrid cross the Fi ratio of a backcross is
1:1
3:1
1:2:1
9:3:3:3
An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as
monohybrid
dihybrid
trihybrid
backcross
The science dealing with study of inheritance and variation is
Genetics
Evolution
Morphology
Cytology
The term 'meiosis' was coined bv
Herting and Van Beneden
Sutton and Boveri
Hofmeister and Waldeyer
Farmer and Moore
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
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
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
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
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.
Which disease results from the genetic inability to synthesize a single enzyme ?
Diabetes
Phenylketonuria
Colour-blindness
Down's syndrome
The segment of DNA which participates in crossing over is known as
recon
muton
criston
replicon
When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
Linked genes may be separated by the process of
gene mutation
segregation
crossing over
polyploidy
Crossing over in meiosis occurs in
leptotene
pachytene
diplotene
diakinesis
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
Diakinesis is characterised by
crossing over
synapse
chiasmata
terminalization
In humans, an example of sex-linked trait is
Curly hair
Sickle-cell anaemia
Colour-blindness
Down's syndrome
The first person to induce mutations was
Hugo de Vries
T.H. Morgan
Sturtevant
H.J. Muller
A chemical mutagen is
X-rays
UV-rays
-rays
5-Bromo-Uracil
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 genetic constitution of an organism is known as
Genome
Genepool
Genotype
Phenotype
A child is bom with an extra chromosome in each of its cells. This is usually the result of
nondisjunction
crossing over
segregation
hybridization
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
A person meets with an accident and great loss of blood has occurred. There is no time to analyse his blood group. It is safe to transfuse blood of
How many meiosis will be required to produce 102 pollen-grains ?
25
25.6
26
26.5
The scientists who rediscovered the Mendel's laws are
Mast and Pantin
Watson and Crick
Corren, Tschermark and Hugo de Vries
Khorana and Nirenberg
A functional unit of a gene which specifies synthesis of one poly-peptide is known as
clone
recon
cistron
codon