Q. No.What is the most significant trend in the evolution of modern man (Homo sapiens) from the ancestors?
1. Increasing cranial capacity
2. Upright posture
3. Shortening of jaws
4. Binocular vision
1. Increasing cranial capacity
2. Upright posture
3. Shortening of jaws
4. Binocular vision
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Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as
1. Genetic flow
2. Genetic drift
3. Random mating
4. Genetic load
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The tendency of population to remain in genetic equilibrium may be disturbed by
1. Random mating
2. Lack of migration
3. Lack of mutations
4. Lack of random mating
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Which is the most common mechanism of genetic variation in the population of a sexually reproduction organism?
1. Transduction
2. Chromosomal aberrations
3. Genetic drift
4. Recombination
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Following are the two statements regarding the origin of life
a. The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
b. The first autotrophic organisms were the chemoautotrophs that never released oxygen
On the above statements which one of the following options is correct?
1. (a) is correct but (b) is false
2. (b) is correct but (a) is false
3. Both (a) and (b) are correct
4. Both (a) and (b) are false
Which of the following structures is homologous to the wing of a bird?
1. Dorsal fin of a shark
2. Wing of a moth
3. Hind limb of Rabbit
4. Flipper of whale
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Which of the following is correct sequence of events in the origin of life?
I. formation of protobionts
II. synthesis of organic monomers
III. synthesis of organic polymers
IV. formation of DNA based genetic systems
1. I, III, II, IV
2. II, III, I, IV
3. II, III, IV, I
4. I, II, III, IV
Genetic drift operates in
1. Large isolated populations
2. Non-reproductive populations
3. Slow reproductive populations
4. Small isolated population
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In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by
1. 2pq
2. Pq
3. q2
4. p2
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Sickle cell anaemia has not been eliminated from African population as
1. It is controlled by dominant genes
2. It is controlled by recessive genes
3. It is not a fatal disease
4. It provides immunity against malaria
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