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.
Correct Answer :
C. no crossing-over can ever take place between them
Related Questions
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.
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
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
The first person to induce mutations was
Hugo de Vries
T.H. Morgan
Sturtevant
H.J. Muller
The genetic constitution of an organism is known as
Genome
Genepool
Genotype
Phenotype
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
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
In a monohybrid cross the Fi ratio of a backcross is
1:1
3:1
1:2:1
9:3:3:3
The condition in which only one allele of a pair is present is known as
Homozygous
Heterozygous
Hemizygous
Incomplete dominance
A giant chromosome having many chromo-nemata lying side by side all along their length is called
megachromosome
heterosome
polytene chromosome
super numerary chromosome
Linked genes may be separated by the process of
gene mutation
segregation
crossing over
polyploidy
A codon is a sequence of 3 nucleolides on
t-RNA
m-RNA
s-RNA
hn-RNA
Transfer of a gene or genes through a virus is called
transformation
transduction
genetic engineering
sex-duction
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
Chromosomes exhibit minimum coiling during
prophase
metaphase
interphase
telophase
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 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.
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 functional unit of a gene which specifies synthesis of one poly-peptide is known as
clone
recon
cistron
codon
The number of characters investigated by Mendel was
four
seven
six
one
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
In humans, an example of sex-linked trait is
Curly hair
Sickle-cell anaemia
Colour-blindness
Down's syndrome
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
Linkage is
directly related to crossing over
same as translocation
inversely related to crossing over
opposite to segregation
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
When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
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