Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
Correct Answer :
D. All of these
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
If an individual does not breed true for its characters, it is called
homozygote
allelomorph
hybrid
ecotype
Which disease results from the genetic inability to synthesize a single enzyme ?
Diabetes
Phenylketonuria
Colour-blindness
Down's syndrome
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
When two genes are situated very close to each other in a chromosome
the percentage of crossing over between themis high
hardly any cross-overs detected
no crossing-over can ever take place between them
only double cross overs can take place between them.
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.
In humans, an example of sex-linked trait is
Curly hair
Sickle-cell anaemia
Colour-blindness
Down's syndrome
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
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.
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 codon is a sequence of 3 nucleolides on
t-RNA
m-RNA
s-RNA
hn-RNA
The science dealing with study of inheritance and variation is
Genetics
Evolution
Morphology
Cytology
The segment of DNA which participates in crossing over is known as
recon
muton
criston
replicon
Transfer of a gene or genes through a virus is called
transformation
transduction
genetic engineering
sex-duction
A giant chromosome having many chromo-nemata lying side by side all along their length is called
megachromosome
heterosome
polytene chromosome
super numerary chromosome
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
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
Chromosomes exhibit minimum coiling during
prophase
metaphase
interphase
telophase
The scientists who rediscovered the Mendel's laws are
Mast and Pantin
Watson and Crick
Corren, Tschermark and Hugo de Vries
Khorana and Nirenberg
Linked genes may be separated by the process of
gene mutation
segregation
crossing over
polyploidy
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
The best method to determine whether an individual is homozygous or heterozygous is
inbreeding
cross-breeding
back-crossing
self-fertilization
Dyad is
a pair of homologous chromosomes
a pair of non-homologous chromosomes
a pair of sister chromosomes
a pair of non-sister chromosomes
The genetic constitution of an organism is known as
Genome
Genepool
Genotype
Phenotype
How many meiosis will be required to produce 102 pollen-grains ?
25
25.6
26
26.5
The number of characters investigated by Mendel was
four
seven
six
one
Down's syndrome is an example of
monosomy
trisomy
triploidy
polyploidy
The first person to induce mutations was
Hugo de Vries
T.H. Morgan
Sturtevant
H.J. Muller