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4

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

Correct Answer :

A. 1:1


Related Questions

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4

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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4

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

A. recon

B. muton

C. criston

D. replicon

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4

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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4

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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4

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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4

 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. AB, RH+

B. AB, RH-

C. O, RH-

D. O, RH+

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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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Linked genes may be separated by the process of

A. gene mutation

B. segregation

C. crossing over

D. polyploidy

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4

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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4

The number of characters investigated by Mendel was

A. four

B. seven

C. six

D. one

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4

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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Reverse transcription was discovered by

A. Watson

B. Crick

C. Temin

D. Porter

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Crossing over in meiosis occurs in

A. leptotene

B. pachytene

C. diplotene

D. diakinesis

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4

 A chemical mutagen is

A. X-rays

B. UV-rays

C. β-rays

D. 5-Bromo-Uracil

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Which one of the following chemical characteristics is not common to all living beings ?

A. Similar triplet codes for amino acids

B. Energy is stored by high energy rich phosphate bonds

C. Types of protein present in the body.

D. Ribosomes act at sites of protein synthesis

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4

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 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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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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4

Base substitutions from base analogues I are called

A. transitions

B. transversions

C. intragenic complimentation

D. intergenic complimentation

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Diakinesis is characterised by

A. crossing over

B. synapse

C. chiasmata

D. terminalization

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4

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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4

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 science dealing with study of inheritance and variation is

A. Genetics

B. Evolution

C. Morphology

D. Cytology

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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 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 first person to induce mutations was

A. Hugo de Vries

B. T.H. Morgan

C. Sturtevant

D. H.J. Muller

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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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4

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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DNA duplication occurs in

A. meiosis only

B. meiosis II and mitosis

C. mitosis only

D. meiosis I and mitosis