Biology GK · all questions

Gentics and Evoloution
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Q121

The superiority of the hybrids over either of the two parents in one or more traits is called

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Q122

Raphanobrassica has been artificially produced from Raphanus sativus and Brassica oleracea by

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Q123

The main factor of evolution is

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Q124

The absence of Y-chromosome in human beings causes

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Q125

The greatest weakness of Darwinism is that it did not explain

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Q126

Who among the following were awarded Nobel Prize for artificial synthesis of the nucleic acids?

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Q127

The origin of universe occurred about

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Q128

Consider the following statements regarding the advantages of biofertilizers and choose the correct answer:
1. Biofertilizers enhance crop yield even under ill irrigated conditions
2. Biofertilizers do not cause atmospheric pollution
3. Biofertilizers are cheap and economical
4. Biofertilizers improve physical and chemical properties of soil

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Q129

Ribose, the pentose sugar of RNA, has an identical structure to DNA except that there is

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Q130

Consider the following statements and choose the correct answer:
1. The structural genes direct the synthesis of cellular proteins through messenger RNA (mRNA)
2. The promoter gene determines whether or not the structural genes are to be repressed by the repressor
3. The regulator gene directs the synthesis of a protein which may be an active repressor or an inactive repressor

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Q131

To study the evolutionary traces, which one of the following will be very useful?

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Q132

The free OH group of the 3' - OH end of one Okazaki fragment and the phosphate group at the 5' end of another are joined by mediation of the enzyme

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Q133

When Nicotiana tabacum is crossed with Nicotiana sylvestris the hybrids produced possess

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Q134

Which one of the following is a hereditary disease?

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Q135

The phenomenon by which different organisms that are not very closely related have developed similar adaptations for life in similar habitats is known as

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Q136

Which of the following initiates transcription of mRNA on the DNA template?

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Q137

Mutation from a wild type allele to a mutant allele is termed

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Q138

Consider the following statements and choose the correct answer:
In order to be a useful vector, a plasmid:
1. Must possess the genes essential for replication of DNA
2. Must carry, at least, one gene that can be used as a marker for the selection of the plasmid in the transformed cell
3. Must include, at least, one gene recognizable by its product or activity, which possesses within it a cutting site for a restriction enzyme
4. In the rep region must contain a cutting site for the restriction enzyme to be used

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Q139

Haemophilia is a genetic disorder which lead to

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Q140

The breakage-fusion-bridge-cycle in Zea mays had been reported by

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