Q281
Open questionThe biological species concept of organisms is based on
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Biology GK · all questionsGentics and Evoloution
Gentics and Evoloution
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Q282
Open questionThe process of isolating a desirable homozygous individual from the mixed population and multiplying the same without contamination to release as a new variety is known as
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Q283
Open questionIn Asparagus
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Q284
Open questionWhich of the following is responsible forn controlling hereditary characters of the living cells?
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Q285
Open questionMatch List-I (Operons) with List-II (Number of structural genes) and select the correct answer:
| List-I | List-II |
| a. Ara Operon of E. coli | 1. 9 structural genes |
| b. His Operon of Salmonella typhimurium | 2. 4 structural genes |
| c. Trp Operon of E. coli | 3. 5 structural genes |
| d. Leu Operon | 4. 3 structural genes |
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Q286
Open questionStudy the following statements.
1. In a monohybrid cross, we study two characters.
2. Garden pea (Pisum sativum) reproduces asexually in nature.
3. In incomplete dominance, one gene (dominant) is mixed with the other gene (recessive).
4. Mendel choose seven visible characters, each with two contrasting forms.
Which of the statements given above is are false?
1. In a monohybrid cross, we study two characters.
2. Garden pea (Pisum sativum) reproduces asexually in nature.
3. In incomplete dominance, one gene (dominant) is mixed with the other gene (recessive).
4. Mendel choose seven visible characters, each with two contrasting forms.
Which of the statements given above is are false?
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Q287
Open questionA true species in Mauritius failed to reproduce because of the extinction of a fruit eating bird. Which one of the following was that bird?
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Q288
Open questionPoint mutation arises due to change in
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Q289
Open questionOrgans those which were functional at one time but iater on during the course of evolution lost their function are called
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Q290
Open questionDinosaurs were
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Q291
Open questionConsider the following statements regarding evidences of evolution and choose the correct answer:
1. Serodiagnostic tests of the members of the families of angiosperms help greatly in tracing out the phylogeny among themselves
2. The barriers like lofty mountains, deserts and sea are responsible for the origin of endemic species of a particular area
3. Endemic species are often found to originate with some closely allied species
4. Domestication of plants means the culture or cultivation of plants
1. Serodiagnostic tests of the members of the families of angiosperms help greatly in tracing out the phylogeny among themselves
2. The barriers like lofty mountains, deserts and sea are responsible for the origin of endemic species of a particular area
3. Endemic species are often found to originate with some closely allied species
4. Domestication of plants means the culture or cultivation of plants
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Q292
Open questionThe sequential steps of the mechanism of translation during protein synthesis are
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Q293
Open questionConsider the following statements regarding the evidences against and for the spore theory of life and choose the correct answer:
1. The theory explains well how life originated and where from the spores came to earth
2. Evidence for the existence of life on other planets came from the discovery of fossils of microorganisms
3. Space research has shown that the bacteria can survive the rigors of space travel and the airless, waterless environment of the moon
1. The theory explains well how life originated and where from the spores came to earth
2. Evidence for the existence of life on other planets came from the discovery of fossils of microorganisms
3. Space research has shown that the bacteria can survive the rigors of space travel and the airless, waterless environment of the moon
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Q294
Open questionThe diamond code and triangle code for amino acids were proposed by
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Q295
Open questionThe theory of natural selection is based on which of the following factors?
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Q296
Open questionIn genetic dictionary, there are 64 codons as
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Q297
Open questionAccording to the ratio theory of sex-determination, which of the following is the determining factor of sex?
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Q298
Open questionThe book 'The Origin of Species' was written by
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Q299
Open questionWhich of the following enzymes facilitates the entry of lactose into the cell?
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Q300
Open questionThe pyrimidines are single ring compounds with nitrogen in which positions of a 6-membered benzene ring?
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