The chromosomal theroy of heredity implies that

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The chromosomal theroy of heredity implies that

A. chromosomes are composed of DNA and protein

B. genes are composed of chromosomes

C. organism cannot live withoutchromosomes

D. genes are located on the chromosomes and are transmitted to the next generation through them.

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The condition in which only one allele of a pair is present is known as

A. Homozygous

B. Heterozygous

C. Hemizygous

D. Incomplete dominance

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How many meiosis will be required to produce 102 pollen-grains ?

A. 25

B. 25.6

C. 26

D. 26.5

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Linked genes may be separated by the process of

A. gene mutation

B. segregation

C. crossing over

D. polyploidy

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A functional unit of a gene which specifies synthesis of one poly-peptide is known as

A. clone

B. recon

C. cistron

D. codon

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The science dealing with study of inheritance and variation is

A. Genetics

B. Evolution

C. Morphology

D. Cytology

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Colour blindness is caused due to

A. deficiency of vitamic C

B. sex-linked abnormality

C. absence of rods in retina

D. absence of visual purple in retina

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Albinism in com plants is best described as

A. lethal

B. sex-linked

C. inbred

D. dominance

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DNA duplication occurs in

A. meiosis only

B. meiosis II and mitosis

C. mitosis only

D. meiosis I and mitosis

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When is the sex of an offspring decided

A. At ovulation

B. During meiosis

C. During cleavage

D. At fertilization

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The chromosomal theroy of heredity implies that

A. chromosomes are composed of DNA and protein

B. genes are composed of chromosomes

C. organism cannot live withoutchromosomes

D. genes are located on the chromosomes and are transmitted to the next generation through them.

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The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by

A. fission

B. budding

C. asexual means

D. sexual means

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Exhibition of superiority by a hybrid over both of its parents is called

A. heterosis

B. hybridization

C. hypostasis

D. dominance

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Reverse transcription was discovered by

A. Watson

B. Crick

C. Temin

D. Porter

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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

A. all tall

B. 50% tall and 50% dwarf

C. all dwarf

D. data insufficient

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Lethal genes are those which

A. cause the death of the organism in which they are present

B. cause the death of the homozygous infant being formed

C. cause the death of heterozygous infant being formed

D. all of the above

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Transfer of a gene or genes through a virus is called

A. transformation

B. transduction

C. genetic engineering

D. sex-duction

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The number of characters investigated by Mendel was

A. four

B. seven

C. six

D. one

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The segment of DNA which participates in crossing over is known as

A. recon

B. muton

C. criston

D. replicon

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Diakinesis is characterised by

A. crossing over

B. synapse

C. chiasmata

D. terminalization

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The nuclear membrane completely disappears during

A. late prophase

B. early metaphase

C. metaphase

D. interphase

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A colour-blind man marries the daughter of a colour-blind person. In their progeny

A. none of her daughters are colour-blind

B. all her sons are colour-blind

C. all her daughters are colour-blind

D. half of her sons are colour-blind

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In the Operon concept, the regulator gene regulates chemical reactions in the cell by

A. inhibiting transcription of m-RNA

B. inactivating enzymes in the reaction

C. inhibiting the substrate in the reaction

D. inhibiting the migration of m-RNA into cytoplasm

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Which disease results from the genetic inability to synthesize a single enzyme ?

A. Diabetes

B. Phenylketonuria

C. Colour-blindness

D. Down's syndrome

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The first person to induce mutations was

A. Hugo de Vries

B. T.H. Morgan

C. Sturtevant

D. H.J. Muller

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Klinefelter's syndrome is developed when the chromosome in male is

A. XXY

B. XXXY

C. XXYY

D. All of these

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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

A. $A B, R H^{+}$

B. $A B, R H^{-}$

C. $O, R H^{-}$

D. $O, R H^{+}$

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A giant chromosome having many chromo-nemata lying side by side all along their length is called

A. megachromosome

B. heterosome

C. polytene chromosome

D. super numerary chromosome

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Down's syndrome is an example of

A. monosomy

B. trisomy

C. triploidy

D. polyploidy

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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

A. TT

B. Tt

C. tt

D. None of these

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Among the following which is a test cross?

A. TtxTt

B. TTxTT

C. TTxTt

D. Ttxtt

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Accepted Answer

D. genes are located on the chromosomes and are transmitted to the next generation through them.

The chromosomal theroy of heredity implies that

Correct Answer :

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