61. The number of chromosomes present in normal human being are
62. 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
63. The nucleosome is
64. 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
| 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 |
65. Transversion occurs when
66. 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
67. The present giraffe has a long neck as compared to its ancestors. Lamarck believed it could be due to
68. During RNA primer formation which of the following processes takes place?
69. If during DNA replication the base is in an enol form, which of the following would be correct?
70. Evolutionary biology is
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