The number of chromosomes present in normal human being are
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Biology GK · all questionsGentics and Evoloution
Gentics and Evoloution
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Consider the following statements and choose the correct answer:
1. Since chromosomal aberrations result in a change in the organism, they are also called chromosomal mutation
2. Chromosomal aberrations are of four types deletion, duplication, inversion and translocation
3. If a single break occurs near the end of a chromosome, it results in an intercalary deletion
4. A deficiency involves loss of a chromosome section
1. Since chromosomal aberrations result in a change in the organism, they are also called chromosomal mutation
2. Chromosomal aberrations are of four types deletion, duplication, inversion and translocation
3. If a single break occurs near the end of a chromosome, it results in an intercalary deletion
4. A deficiency involves loss of a chromosome section
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The nucleosome is
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Match List-I with List-II and select the correct answer:
| List-I | List-II |
| a. The Cairns model | 1. The newly formed DNA strands become covalently joined to the ends of the parental chromosomes |
| b. The Yoshikawa model | 2. Replication begins by denaturation of the DNA double strands at a specific site called origin |
| c. The rolling circle model | 3. The chromosome first becomes double stranded by the synthesis of a negative strand |
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Transversion occurs when
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Consider the following statements regarding the laws of evolution from Lamarck's thesis and choose the correct answer:
1. The internal forces of life tend to increase the size of an organism not only as a whole but in every part as well
2. Each organ or part is the outcome of the new movement which in turn is initiated by a new and continuous need or want
3. All that has been acquired by an individual organism during its lifetime is transmitted by heredity to its offsprings in the next generation
1. The internal forces of life tend to increase the size of an organism not only as a whole but in every part as well
2. Each organ or part is the outcome of the new movement which in turn is initiated by a new and continuous need or want
3. All that has been acquired by an individual organism during its lifetime is transmitted by heredity to its offsprings in the next generation
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The present giraffe has a long neck as compared to its ancestors. Lamarck believed it could be due to
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During RNA primer formation which of the following processes takes place?
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If during DNA replication the base is in an enol form, which of the following would be correct?
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Evolutionary biology is
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Which of the following statements about DNA is/are correct?
1. DNA is the hereditary material of all living organisms.
2. All segments of DNA code for synthesis of proteins.
3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel.
4. DNA is also found in mitochondria.
Select the correct answer:
1. DNA is the hereditary material of all living organisms.
2. All segments of DNA code for synthesis of proteins.
3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel.
4. DNA is also found in mitochondria.
Select the correct answer:
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Sterility in autopolyploids is usually due to
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Of the total number of genes inherited by a child
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Plant tissue cultures generally grow best at
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A nonsense code
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Because of the purine-pyrimidine pairing the total number of purines in a double stranded DNA molecule is
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Such cases in which linked genes are transmitted together to the offsprings only in their original or parental combination for two or more or several generations exhibit
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A purine molecule consists of which of the following joined to a pyrimidine ring at positions 4' and 5'?
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The entire seedling formed by the activity of the plumular pole of the embryo is through the process of
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According to which of the following theories, multiple alleles do not represent gene mutations at a given locus but they occupy different loci which lie in close association in a chromosome?
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