Q. No.Directional selection favours:
(1) Both extremes of a trait
(2) Intermediate form of a trait
(3) Environmental differences
(4) One extreme form over the other extreme form and over intermediate forms of the trait
Most often the factor that initiates the speciation of two populations is:
(1) Geographic isolation
(2) Inability of the gametes to fuse
(3) Different courtship behaviours
(4) Different copulatory organs
The oldest fossils resemble:
1. Amoeba
2. Red algae
3. Heterotrophic bacteria
4. Autotrophic bacteria
Reptilian ancestors of the mammals were the :-
1. Therapsids
2. Thecodonts
3. Pterosaurs
4. Plesiosaurs
Lamarck's theory of evolution is also called
1. Theory of special creation
2. Inheritance of acquired characters
3. Survival of the fittest
4. None of these
Industrial melanism is an example of
(1) Neo Darwinism
(2) Natural selection
(3) Mutation
(4) Neo Lamarckism
Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?
(1) Transduction
(2) Chromosomal aberrations
(3) Genetic drift
(4) Recombination
Artificial selection to obtain cows yielding high milk output represents
| 1. | Stabilising selection as it stabilizes this character in the population |
| 2. | Directional as it pushes the mean of the character in one direction |
| 3. | Disruptive as it spills the population into two, one yielding higher output and the other lower output |
| 4. | Stabilizing followed by disruptive as it stabilizes the population of producing higher yielding cows |
In Hardy- Weinberg equation, the frequency of heterozygous individual is represented by
(1) P2
(2) 2pq
(3) pq
(4) q2
Which of the following is the 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,II,III,IV
(2) I,III,II,IV
(3) II,III,I,IV
(4) II,III,IV,I
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