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

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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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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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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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Chromosomes exhibit minimum coiling during

A. prophase

B. metaphase

C. interphase

D. telophase

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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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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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Dyad is

A. a pair of homologous chromosomes

B. a pair of non-homologous chromosomes

C. a pair of sister chromosomes

D. a pair of non-sister chromosomes

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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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The term 'meiosis' was coined bv

A. Herting and Van Beneden

B. Sutton and Boveri

C. Hofmeister and Waldeyer

D. Farmer and Moore

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A codon is a sequence of 3 nucleolides on

A. t-RNA

B. m-RNA

C. s-RNA

D. hn-RNA

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The number of characters investigated by Mendel was

A. four

B. seven

C. six

D. one

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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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A chemical mutagen is

A. X-rays

B. UV-rays

C. $β$ -rays

D. 5-Bromo-Uracil

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The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of

A. all heterozygous tall

B. two tall and two dwarf

C. one homozygous tall, two heterozygous tall and one homozygous dwarf

D. all homozygous dwarf.

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Among the following which is a test cross?

A. TtxTt

B. TTxTT

C. TTxTt

D. Ttxtt

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Linkage is

A. directly related to crossing over

B. same as translocation

C. inversely related to crossing over

D. opposite to segregation

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A child is bom with an extra chromosome in each of its cells. This is usually the result of

A. nondisjunction

B. crossing over

C. segregation

D. hybridization

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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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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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Diakinesis is characterised by

A. crossing over

B. synapse

C. chiasmata

D. terminalization

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Base substitutions from base analogues I are called

A. transitions

B. transversions

C. intragenic complimentation

D. intergenic complimentation

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In a monohybrid cross the Fi ratio of a backcross is

A. 1:1

B. 3:1

C. 1:2:1

D. 9:3:3:3

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When two genes are situated very close to each other in a chromosome

A. the percentage of crossing over between themis high

B. hardly any cross-overs detected

C. no crossing-over can ever take place between them

D. only double cross overs can take place between them.

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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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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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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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Linked genes may be separated by the process of

A. gene mutation

B. segregation

C. crossing over

D. polyploidy

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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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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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The nuclear membrane completely disappears during

A. late prophase

B. early metaphase

C. metaphase

D. interphase

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The genetic constitution of an organism is known as

A. Genome

B. Genepool

C. Genotype

D. Phenotype

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Accepted Answer

A. inhibiting transcription of m-RNA

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

Correct Answer :

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