Linked genes may be separated by the process of
gene mutation
segregation
crossing over
polyploidy
Correct Answer :
B. segregation
Related Questions
A functional unit of a gene which specifies synthesis of one poly-peptide is known as
clone
recon
cistron
codon
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
Chromosomes exhibit minimum coiling during
prophase
metaphase
interphase
telophase
Diakinesis is characterised by
crossing over
synapse
chiasmata
terminalization
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 nuclear membrane completely disappears during
late prophase
early metaphase
metaphase
interphase
The number of characters investigated by Mendel was
four
seven
six
one
In a monohybrid cross the Fi ratio of a backcross is
1:1
3:1
1:2:1
9:3:3:3
A child is bom with an extra chromosome in each of its cells. This is usually the result of
nondisjunction
crossing over
segregation
hybridization
Which disease results from the genetic inability to synthesize a single enzyme ?
Diabetes
Phenylketonuria
Colour-blindness
Down's syndrome
How many meiosis will be required to produce 102 pollen-grains ?
25
25.6
26
26.5
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
The science dealing with study of inheritance and variation is
Genetics
Evolution
Morphology
Cytology
When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
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
DNA duplication occurs in
meiosis only
meiosis II and mitosis
mitosis only
meiosis I and mitosis
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
An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as
monohybrid
dihybrid
trihybrid
backcross
Down's syndrome is an example of
monosomy
trisomy
triploidy
polyploidy
Among the following which is a test cross?
TtxTt
TTxTT
TTxTt
Ttxtt
Crossing over in meiosis occurs in
leptotene
pachytene
diplotene
diakinesis
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 condition in which only one allele of a pair is present is known as
Homozygous
Heterozygous
Hemizygous
Incomplete dominance
If an individual does not breed true for its characters, it is called
homozygote
allelomorph
hybrid
ecotype
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
The best method to determine whether an individual is homozygous or heterozygous is
inbreeding
cross-breeding
back-crossing
self-fertilization
The scientists who rediscovered the Mendel's laws are
Mast and Pantin
Watson and Crick
Corren, Tschermark and Hugo de Vries
Khorana and Nirenberg