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
Correct Answer :
C. Hardly-Weinberg law
Related Questions
DNA duplication occurs in
meiosis only
meiosis II and mitosis
mitosis only
meiosis I and mitosis
The scientists who rediscovered the Mendel's laws are
Mast and Pantin
Watson and Crick
Corren, Tschermark and Hugo de Vries
Khorana and Nirenberg
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.
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
Colour blindness is caused due to
deficiency of vitamic C
sex-linked abnormality
absence of rods in retina
absence of visual purple in retina
A chemical mutagen is
X-rays
UV-rays
-rays
5-Bromo-Uracil
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
The segment of DNA which participates in crossing over is known as
recon
muton
criston
replicon
How many meiosis will be required to produce 102 pollen-grains ?
25
25.6
26
26.5
Among the following which is a test cross?
TtxTt
TTxTT
TTxTt
Ttxtt
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
In a monohybrid cross the Fi ratio of a backcross is
1:1
3:1
1:2:1
9:3:3:3
The science dealing with study of inheritance and variation is
Genetics
Evolution
Morphology
Cytology
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 child is bom with an extra chromosome in each of its cells. This is usually the result of
nondisjunction
crossing over
segregation
hybridization
The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
fission
budding
asexual means
sexual means
Crossing over in meiosis occurs in
leptotene
pachytene
diplotene
diakinesis
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 disease results from the genetic inability to synthesize a single enzyme ?
Diabetes
Phenylketonuria
Colour-blindness
Down's syndrome
Dyad is
a pair of homologous chromosomes
a pair of non-homologous chromosomes
a pair of sister chromosomes
a pair of non-sister chromosomes
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
Chromosomes exhibit minimum coiling during
prophase
metaphase
interphase
telophase
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
Exhibition of superiority by a hybrid over both of its parents is called
heterosis
hybridization
hypostasis
dominance
The best method to determine whether an individual is homozygous or heterozygous is
inbreeding
cross-breeding
back-crossing
self-fertilization
Transfer of a gene or genes through a virus is called
transformation
transduction
genetic engineering
sex-duction
A codon is a sequence of 3 nucleolides on
t-RNA
m-RNA
s-RNA
hn-RNA
Linkage is
directly related to crossing over
same as translocation
inversely related to crossing over
opposite to segregation
When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
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.