A cross between heterozygous F1 hybrid and the double recessive homozygous is known as
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Biology GK · all questionsGentics and Evoloution
Gentics and Evoloution
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Who among the following synthesized sulphobes from ammonium thiocyanate and formalin and also reported the formation of two amino acids and a condensation product plus pigments?
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Trisomy stands for
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The number of DNA molecules per chromatids are
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Recently, who among the following succeeded in synthesising a nucleic acid molecule of six nucleotide units?
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Big-Bang theory attempts to explain the origin of
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Match List-I with List-II and select the correct answer:
| List-I | List-II |
| a. Monohybrid cross | 1. Involves the study of inheritance of two pairs of contrasting characters |
| b. Dihybrid cross | 2. Involves two crosses concerning the same character but with reversed sexes |
| c. Polyhybrid cross | 3. Involves the study of inheritance of one pair of contrasting characters |
| d. Reciprocal cross | 4. Includes those crosses in which inheritance of more than two pairs of genes is concerned |
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Which of the following suggests that at every level from the molecule through the supramolecular organelle, the cell, the tissue, the organism, the individualand upto the population or the society, the properties of life depend only to a small degree upon the substances of which living matter is composed?
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With reference to the evolution of living organism, which one of the following sequence is correct?
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Neo-Darwinians believed that characters are not inherited as such but there are character determiners which control only the development called
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Ponnamperurna (1965) demonstrated the production of adenosine by heating dilute aqueous solutions of
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Consider the following statements regarding evolution and choose the correct answer:
1. Basically, evolution is the result of the differential survival in each generation of the progeny of the individuals with certain special characteristics
2. The organization of genes in chromosomes and the behaviour of these during cell division do not affect the mechanisms of evolution
3. Due to sexual reproduction there is a tremendous increase in variability
4. Differential survival is always partly due to capacity to adopt to the physical environment
1. Basically, evolution is the result of the differential survival in each generation of the progeny of the individuals with certain special characteristics
2. The organization of genes in chromosomes and the behaviour of these during cell division do not affect the mechanisms of evolution
3. Due to sexual reproduction there is a tremendous increase in variability
4. Differential survival is always partly due to capacity to adopt to the physical environment
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Consider the following statements.
1. Human beings have 23 pairs of chromosomes.
2. Sex chromosome in human male are named XY.
3. Chromosomes are best seen in metaphase.
Which of the statements given above is/are false about chromosomes?
1. Human beings have 23 pairs of chromosomes.
2. Sex chromosome in human male are named XY.
3. Chromosomes are best seen in metaphase.
Which of the statements given above is/are false about chromosomes?
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The most commonly used methods for mapping viral chromosomes utilise
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Latest ancestor of modern human is
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Thymidine dimer formation in DNA is caused by
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In prokaryotes, which elongation factors are required for binding the aminoacyl tRNA to the ribosome?
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Archaeopteryx had the following reptilian characters
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During the formation of initiation complex the mRNA attaches to the 30 S subunit of ribosome which is then called
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Consider the following statements regarding the advantages of embryo culture and choose the correct answer:
1. It is the excellent method for understanding the nutritive requirements of the developing embryo
2. Embryo culture gives an insight into the factors which influence embryonic differentiation
3. It promises to be of great economic value as a means of achieving a much wider range of hybrid plants
4. Seeds, which normally remain dormant, can be made to germinate immediately by the help of embryo culture technique
1. It is the excellent method for understanding the nutritive requirements of the developing embryo
2. Embryo culture gives an insight into the factors which influence embryonic differentiation
3. It promises to be of great economic value as a means of achieving a much wider range of hybrid plants
4. Seeds, which normally remain dormant, can be made to germinate immediately by the help of embryo culture technique
Select an option to see the answer and solution.