The scientists who rediscovered the Mendel's laws are

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The scientists who rediscovered the Mendel's laws are

A. Mast and Pantin

B. Watson and Crick

C. Corren, Tschermark and Hugo de Vries

D. Khorana and Nirenberg

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The best method to determine whether an individual is homozygous or heterozygous is

A. inbreeding

B. cross-breeding

C. back-crossing

D. self-fertilization

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If an individual does not breed true for its characters, it is called

A. homozygote

B. allelomorph

C. hybrid

D. ecotype

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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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An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as

A. monohybrid

B. dihybrid

C. trihybrid

D. backcross

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

A. recon

B. muton

C. criston

D. replicon

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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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The nuclear membrane completely disappears during

A. late prophase

B. early metaphase

C. metaphase

D. interphase

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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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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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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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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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In humans, an example of sex-linked trait is

A. Curly hair

B. Sickle-cell anaemia

C. Colour-blindness

D. Down's syndrome

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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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The science dealing with study of inheritance and variation is

A. Genetics

B. Evolution

C. Morphology

D. Cytology

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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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Reverse transcription was discovered by

A. Watson

B. Crick

C. Temin

D. Porter

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Chromosomes exhibit minimum coiling during

A. prophase

B. metaphase

C. interphase

D. telophase

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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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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 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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Linked genes may be separated by the process of

A. gene mutation

B. segregation

C. crossing over

D. polyploidy

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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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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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Crossing over in meiosis occurs in

A. leptotene

B. pachytene

C. diplotene

D. diakinesis

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Accepted Answer

C. Corren, Tschermark and Hugo de Vries

The scientists who rediscovered the Mendel's laws are

Correct Answer :

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Related Questions

The best method to determine whether an individual is homozygous or heterozygous is

If an individual does not breed true for its characters, it is called

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

An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as

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

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

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

Among the following which is a test cross?

A codon is a sequence of 3 nucleolides on

The term 'meiosis' was coined bv

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

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

The nuclear membrane completely disappears during

Transfer of a gene or genes through a virus is called

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

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

The first person to induce mutations was

In humans, an example of sex-linked trait is

Colour blindness is caused due to

The science dealing with study of inheritance and variation is

Lethal genes are those which

Reverse transcription was discovered by

Chromosomes exhibit minimum coiling during

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

Linkage is

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

Linked genes may be separated by the process of

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

Dyad is

Crossing over in meiosis occurs in

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