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
Correct Answer :
C.
Related Questions
When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
The first person to induce mutations was
Hugo de Vries
T.H. Morgan
Sturtevant
H.J. Muller
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
How many meiosis will be required to produce 102 pollen-grains ?
25
25.6
26
26.5
In humans, an example of sex-linked trait is
Curly hair
Sickle-cell anaemia
Colour-blindness
Down's syndrome
The term 'meiosis' was coined bv
Herting and Van Beneden
Sutton and Boveri
Hofmeister and Waldeyer
Farmer and Moore
Crossing over in meiosis occurs in
leptotene
pachytene
diplotene
diakinesis
Albinism in com plants is best described as
lethal
sex-linked
inbred
dominance
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
DNA duplication occurs in
meiosis only
meiosis II and mitosis
mitosis only
meiosis I and mitosis
The condition in which only one allele of a pair is present is known as
Homozygous
Heterozygous
Hemizygous
Incomplete dominance
Exhibition of superiority by a hybrid over both of its parents is called
heterosis
hybridization
hypostasis
dominance
In a monohybrid cross the Fi ratio of a backcross is
1:1
3:1
1:2:1
9:3:3:3
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
Linkage is
directly related to crossing over
same as translocation
inversely related to crossing over
opposite to segregation
A child is bom with an extra chromosome in each of its cells. This is usually the result of
nondisjunction
crossing over
segregation
hybridization
Down's syndrome is an example of
monosomy
trisomy
triploidy
polyploidy
Chromosomes exhibit minimum coiling during
prophase
metaphase
interphase
telophase
A functional unit of a gene which specifies synthesis of one poly-peptide is known as
clone
recon
cistron
codon
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
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
If an individual does not breed true for its characters, it is called
homozygote
allelomorph
hybrid
ecotype
The best method to determine whether an individual is homozygous or heterozygous is
inbreeding
cross-breeding
back-crossing
self-fertilization
Diakinesis is characterised by
crossing over
synapse
chiasmata
terminalization
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
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 number of characters investigated by Mendel was
four
seven
six
one
Colour blindness is caused due to
deficiency of vitamic C
sex-linked abnormality
absence of rods in retina
absence of visual purple in retina
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation