Biology GK · all questions

Gentics and Evoloution
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Q81

Consider the following statements and choose the correct answer:
1. In the phenomenon of linkage and crossing over, the genes are arranged in a linear order in a chromosome
2. The linkage groups in an organism are equivalent to the number of chromosome pairs
3. The chances of crossing over are more between two closely placed genes as compared to the genes placed in far proximity
4. The position of genes is very definite in the chromatid

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Q82

Consider the following statements regarding the DNA-mediated gene transfer and choose the correct answer:
1. DNA fragments carrying the gene to be transferred are mixed with a carrier DNA
2. They are then precipitated out with a calcium phosphate buffer
3. The precipitate is used to transform target cells
4. The Ca-precipitated DNA enters the cell by exocytosis

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Q83

Any change in the sequence of nucleotides of a DNA molecule results in a change in the triplets, giving rise to

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Q84

Barr body is absent in somatic cell of

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Q85

The first attempt to grow angiosperm embryos in vitro under aseptic conditions was made by

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Q86

Among the chemical mutagens, hydroxylamine affects

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Q87

Consider the following statements of Kupier (1949, 1951) and choose the correct answer:
1. A part of a huge cloud of dust and gas condensed to form primarily a proto-sun of low density surrounded by a rotating cloud disk
2. The proto-earth probably was a low-temperature body of gases and solids of about 500 times the earth's present mass
3. The accumulation of cold solid, the planetesimals, is the main process in the formation of primitive earth
4. The size of the planetesimals ranged in between the size of asteroids and that of dust particles

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Q88

The reactions involved in translocation during protein synthesis include

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Q89

According to the morphological and anatomical evidences of organic evolution, the similarity in the structure of the strobili of Lycopods and gymnosperms prove that

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Q90

There are certain forms of species where males are altogether absent and females are produced by parthenogenesis which are always

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Q91

Which of the following blood groups may be present in the children of a couple having blood groups A and B, respectively?

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Q92

August Weismann proposed

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Q93

Which of the following is a versatile cloning vehicle used most frequently as a cloning vector?

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Q94

Consider the following statements regarding the characters of coacervate droplets and choose the correct answer:
1. These can take up materials from the external medium and some of them show enzymatic activities
2. When glucose-I-phosphate is dissolved in the equilibrium liquid, the droplets are found to store starch
3. Coacervate droplets of some sort have been prepared with phosphorylase and β-amylase
4. Polynucleotides were synthesized enzymatically within coacervate droplets

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Q95

Consider the following statements and choose the correct answer:
1. Darwinism accounts for the survival of the fittest but not the arrival of the fittest
2. Natural selection is able to explain the existence of some structures in plants and animals which are not helpful in their survival
3. Darwinism explains the struggle amongst young individuals as well as its influence upon adult characteristics
4. Variations, that occur at random, can never be of the utmost importance and can not explain the production of highly organised and specialised structures

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Q96

Reciprocal translocation can be

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Q97

The examples of crop improvement by mutation breeding include:

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Q98

Mendel worked on

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Q99

Which of the following mutagens belong to the non-ionizing radiation category?

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Q100

Extrachromosomal DNA are found mostly in prokaryotes as

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