Linkage is
directly related to crossing over
same as translocation
inversely related to crossing over
opposite to segregation
Correct Answer :
C. inversely related to crossing over
Related Questions
Dyad is
a pair of homologous chromosomes
a pair of non-homologous chromosomes
a pair of sister chromosomes
a pair of non-sister chromosomes
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
Transfer of a gene or genes through a virus is called
transformation
transduction
genetic engineering
sex-duction
The condition in which only one allele of a pair is present is known as
Homozygous
Heterozygous
Hemizygous
Incomplete dominance
The number of characters investigated by Mendel was
four
seven
six
one
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
A functional unit of a gene which specifies synthesis of one poly-peptide is known as
clone
recon
cistron
codon
The nuclear membrane completely disappears during
late prophase
early metaphase
metaphase
interphase
Reverse transcription was discovered by
Watson
Crick
Temin
Porter
Linkage is
directly related to crossing over
same as translocation
inversely related to crossing over
opposite to segregation
The segment of DNA which participates in crossing over is known as
recon
muton
criston
replicon
Base substitutions from base analogues I are called
transitions
transversions
intragenic complimentation
intergenic complimentation
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
A child is bom with an extra chromosome in each of its cells. This is usually the result of
nondisjunction
crossing over
segregation
hybridization
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
Down's syndrome is an example of
monosomy
trisomy
triploidy
polyploidy
Diakinesis is characterised by
crossing over
synapse
chiasmata
terminalization
In humans, an example of sex-linked trait is
Curly hair
Sickle-cell anaemia
Colour-blindness
Down's syndrome
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.
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
Which disease results from the genetic inability to synthesize a single enzyme ?
Diabetes
Phenylketonuria
Colour-blindness
Down's syndrome
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.
An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as
monohybrid
dihybrid
trihybrid
backcross
Crossing over in meiosis occurs in
leptotene
pachytene
diplotene
diakinesis
Colour blindness is caused due to
deficiency of vitamic C
sex-linked abnormality
absence of rods in retina
absence of visual purple in retina
How many meiosis will be required to produce 102 pollen-grains ?
25
25.6
26
26.5
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
If an individual does not breed true for its characters, it is called
homozygote
allelomorph
hybrid
ecotype
Albinism in com plants is best described as
lethal
sex-linked
inbred
dominance