Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
Correct Answer :
A. transitions
Related Questions
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
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
The term 'meiosis' was coined bv
Herting and Van Beneden
Sutton and Boveri
Hofmeister and Waldeyer
Farmer and Moore
Which disease results from the genetic inability to synthesize a single enzyme ?
Diabetes
Phenylketonuria
Colour-blindness
Down's syndrome
The condition in which only one allele of a pair is present is known as
Homozygous
Heterozygous
Hemizygous
Incomplete dominance
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
The scientists who rediscovered the Mendel's laws are
Mast and Pantin
Watson and Crick
Corren, Tschermark and Hugo de Vries
Khorana and Nirenberg
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
Transfer of a gene or genes through a virus is called
transformation
transduction
genetic engineering
sex-duction
DNA duplication occurs in
meiosis only
meiosis II and mitosis
mitosis only
meiosis I and mitosis
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 giant chromosome having many chromo-nemata lying side by side all along their length is called
megachromosome
heterosome
polytene chromosome
super numerary chromosome
Among the following which is a test cross?
TtxTt
TTxTT
TTxTt
Ttxtt
When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
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
Crossing over in meiosis occurs in
leptotene
pachytene
diplotene
diakinesis
The science dealing with study of inheritance and variation is
Genetics
Evolution
Morphology
Cytology
The number of characters investigated by Mendel was
four
seven
six
one
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
The first person to induce mutations was
Hugo de Vries
T.H. Morgan
Sturtevant
H.J. Muller
The segment of DNA which participates in crossing over is known as
recon
muton
criston
replicon
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
If an individual does not breed true for its characters, it is called
homozygote
allelomorph
hybrid
ecotype
The genetic constitution of an organism is known as
Genome
Genepool
Genotype
Phenotype
In humans, an example of sex-linked trait is
Curly hair
Sickle-cell anaemia
Colour-blindness
Down's syndrome
Linked genes may be separated by the process of
gene mutation
segregation
crossing over
polyploidy
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
A chemical mutagen is
X-rays
UV-rays
-rays
5-Bromo-Uracil
Chromosomes exhibit minimum coiling during
prophase
metaphase
interphase
telophase