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.
Correct Answer :
C. one homozygous tall, two heterozygous tall and one homozygous dwarf
Related Questions
The science dealing with study of inheritance and variation is
Genetics
Evolution
Morphology
Cytology
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
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
Albinism in com plants is best described as
lethal
sex-linked
inbred
dominance
The segment of DNA which participates in crossing over is known as
recon
muton
criston
replicon
Linked genes may be separated by the process of
gene mutation
segregation
crossing over
polyploidy
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 best method to determine whether an individual is homozygous or heterozygous is
inbreeding
cross-breeding
back-crossing
self-fertilization
If an individual does not breed true for its characters, it is called
homozygote
allelomorph
hybrid
ecotype
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 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
Klinefelter's syndrome is developed when the chromosome in male is
XXY
XXXY
XXYY
All of these
The term 'meiosis' was coined bv
Herting and Van Beneden
Sutton and Boveri
Hofmeister and Waldeyer
Farmer and Moore
Exhibition of superiority by a hybrid over both of its parents is called
heterosis
hybridization
hypostasis
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
Which disease results from the genetic inability to synthesize a single enzyme ?
Diabetes
Phenylketonuria
Colour-blindness
Down's syndrome
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
How many meiosis will be required to produce 102 pollen-grains ?
25
25.6
26
26.5
Diakinesis is characterised by
crossing over
synapse
chiasmata
terminalization
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
DNA duplication occurs in
meiosis only
meiosis II and mitosis
mitosis only
meiosis I and mitosis
Chromosomes exhibit minimum coiling during
prophase
metaphase
interphase
telophase
The first person to induce mutations was
Hugo de Vries
T.H. Morgan
Sturtevant
H.J. Muller
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.
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
The nuclear membrane completely disappears during
late prophase
early metaphase
metaphase
interphase
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 genetic constitution of an organism is known as
Genome
Genepool
Genotype
Phenotype