Biology GK · all questions

Gentics and Evoloution
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Q261

Assertion (A) Haemophilia never occurs to women.
Reason (R) Gene for haemophilia are found in X-chromosomes.

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Q262

The basic requirements for the life to arise include

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Q263

For a colourblind person, red colour appear as

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Q264

Assertion (A) Human beings have 23 pair of chromosomes, one of which is the sex chromosomes and the remaining are 22 autosomes. The X-linked disease are related to mutation on a sex chromosomes.
Reason (R) Colour blindness results from a mutation in X-chromosome.

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Q265

The X-chromosome or the X-body was first observed by

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Q266

Which of the following enzymes does not need a template for DNA polymerization but insists on a primer?

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Q267

In autopolyploids, there is

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Q268

Theory of origin of life as a result of chemical evolution has been properly explained by

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Q269

The concept of 'survival of the fittest' was first advocated by

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Q270

Match List-I (Evolutionists) with List-II (Achievements) and select the correct answer:

List-I	List-II
a. Haeckel	1. Emphasized the effects of different environments on isolated forms
b. Wagner	2. Suggested that an inner directive guides the course of evolution mainly independent of the environment
c. Guli	3. Pointed out the inevitability of divergence even without difference in environment
d. Karl Nageli	4. Constructed phylogeny of vertebrates on their embryological development

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Q271

Who among the following adopted the term evolution to cover Darwin's notions as well as to include the conception which explains the entire process of change occurring in the universe?

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Q272

Organic evolution is also called

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Q273

The difference between Homo sapiens and the Homo erectus was

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Q274

The wing of a bat and the wing of a bird are the examples of . . . . . . . . limbs.

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Q275

Which of the following basic processes provide the genetic variability without which change cannot take place?

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Q276

Which phenomena leads to the variation in

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Q277

The lactose (lac) operon of the bacterium E. coli has which of the following structural genes?

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Q278

Match List-I (Growth Regulators) with List-II (Functions) and select the correct answer:

List-I	List-II
a. Auxin	1. Causes uniform ripening in many fruits
b. Ethylene	2. Induces formation of roots on stem cuttings of many ornamental, horticultural and forest trees
c. Gibberellin	3. Used to prolong storage of potato and many fruits
d. Maleic hydrazide	4. Used to delay ripening in lemons

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Q279

Positive control of gene expression can be exercised directly by

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Q280

2X-chromosomes in a diploid organism produce a

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