Biology GK · all questions

Gentics and Evoloution
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Q421

The type of mutants which have been most useful for dissecting the steps in the process of DNA replication, are the ones known as

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Q422

Which of the following will form a new species?

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Q423

The phenomenon of a single major gene influencing more than one character is known as

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Q424

The phenomena in which one gene controls two or more different characters simultaneously is called

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Q425

According to the dispersive method of DNA replication,

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Q426

Match List-I (Biogeographical regions) with List-II (Locations) and select the correct answer:

List-I	List-II
a. Nearctic	1. Central South of America
b. Palearctic	2. Asia, south of Himalayas
c. Neotropical	3. North America down to the Mexican Plateau
d. Oriental	4. Asia North of the Himalayas, Europe and Africa, North of Sahara Desert

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Q427

Number of chromosome in a normal human body cell is

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Q428

Chromosomal abbreviation is commonly found in the

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Q429

Consider the following statements regarding satellite DNA and choose the correct answer:
1. Satellite or Repetitive DNA consists of short identical genes which are repeated in tandem several hundred or thousand times
2. Such DNA is found in the region of the chromosome adjacent to the centromere
3. It is easy to separate repetitive DNA by ultracentrifugation

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Q430

In prokaryotes, multiple ribosomes (polysomes) participate in

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Q431

Assertion (A) DNA fingerprinting has become a powerful tool to establish paternity and identity of criminal in rape and assault cases.
Reason (R) Trace evidences such as hair, saliva and dried semen are adequate for DNA analysis

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Q432

Usually, the greatest interference is between loci which are

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Q433

In case of less friable tissues, dispersion may be improved by modifying the nutrient medium in several ways which include

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Q434

Increase of age decreases

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Q435

Reduction of hydration of the B form of DNA below 66%, with excess of salt present, results in the

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Q436

The physical process of interchange of corresponding parts between the chromatids of a homologous pair of chromosomes that results in the recombination of linked genes is known as

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Q437

Which of the following enzymes catalyses the synthesis of RNA molecules complementary to single-strand DNA template?

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Q438

The mechanisms or possibilities, according to which further advancement of life was achieved when the protobionts acquired the informational macromolecules the DNA, include:

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Q439

The reason of large scale diversity among the organisms is

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Q440

Darwin's theory of natural selection is based on

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